documentation: update Documentation/filesystem/proc.txt and Documentation/sysctls
Now /proc/sys is described in many places and much information is redundant. This patch updates the proc.txt and move the /proc/sys desciption out to the files in Documentation/sysctls. Details are: merge - 2.1 /proc/sys/fs - File system data - 2.11 /proc/sys/fs/mqueue - POSIX message queues filesystem - 2.17 /proc/sys/fs/epoll - Configuration options for the epoll interface with Documentation/sysctls/fs.txt. remove - 2.2 /proc/sys/fs/binfmt_misc - Miscellaneous binary formats since it's not better then the Documentation/binfmt_misc.txt. merge - 2.3 /proc/sys/kernel - general kernel parameters with Documentation/sysctls/kernel.txt remove - 2.5 /proc/sys/dev - Device specific parameters since it's obsolete the sysfs is used now. remove - 2.6 /proc/sys/sunrpc - Remote procedure calls since it's not better then the Documentation/sysctls/sunrpc.txt move - 2.7 /proc/sys/net - Networking stuff - 2.9 Appletalk - 2.10 IPX to newly created Documentation/sysctls/net.txt. remove - 2.8 /proc/sys/net/ipv4 - IPV4 settings since it's not better then the Documentation/networking/ip-sysctl.txt. add - Chapter 3 Per-Process Parameters to descibe /proc/<pid>/xxx parameters. Signed-off-by: Shen Feng <shen@cn.fujitsu.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -10,6 +10,8 @@ fs.txt
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- documentation for /proc/sys/fs/*.
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kernel.txt
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- documentation for /proc/sys/kernel/*.
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net.txt
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- documentation for /proc/sys/net/*.
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sunrpc.txt
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- documentation for /proc/sys/sunrpc/*.
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vm.txt
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@ -1,5 +1,6 @@
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Documentation for /proc/sys/fs/* kernel version 2.2.10
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(c) 1998, 1999, Rik van Riel <riel@nl.linux.org>
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(c) 2009, Shen Feng<shen@cn.fujitsu.com>
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For general info and legal blurb, please look in README.
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@ -14,7 +15,12 @@ kernel. Since some of the files _can_ be used to screw up your
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system, it is advisable to read both documentation and source
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before actually making adjustments.
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1. /proc/sys/fs
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----------------------------------------------------------
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Currently, these files are in /proc/sys/fs:
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- aio-max-nr
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- aio-nr
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- dentry-state
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- dquot-max
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- dquot-nr
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@ -30,8 +36,15 @@ Currently, these files are in /proc/sys/fs:
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- super-max
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- super-nr
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Documentation for the files in /proc/sys/fs/binfmt_misc is
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in Documentation/binfmt_misc.txt.
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==============================================================
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aio-nr & aio-max-nr:
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aio-nr is the running total of the number of events specified on the
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io_setup system call for all currently active aio contexts. If aio-nr
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reaches aio-max-nr then io_setup will fail with EAGAIN. Note that
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raising aio-max-nr does not result in the pre-allocation or re-sizing
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of any kernel data structures.
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==============================================================
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@ -178,3 +191,60 @@ requests. aio-max-nr allows you to change the maximum value
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aio-nr can grow to.
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==============================================================
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2. /proc/sys/fs/binfmt_misc
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----------------------------------------------------------
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Documentation for the files in /proc/sys/fs/binfmt_misc is
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in Documentation/binfmt_misc.txt.
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3. /proc/sys/fs/mqueue - POSIX message queues filesystem
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----------------------------------------------------------
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The "mqueue" filesystem provides the necessary kernel features to enable the
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creation of a user space library that implements the POSIX message queues
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API (as noted by the MSG tag in the POSIX 1003.1-2001 version of the System
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Interfaces specification.)
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The "mqueue" filesystem contains values for determining/setting the amount of
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resources used by the file system.
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/proc/sys/fs/mqueue/queues_max is a read/write file for setting/getting the
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maximum number of message queues allowed on the system.
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/proc/sys/fs/mqueue/msg_max is a read/write file for setting/getting the
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maximum number of messages in a queue value. In fact it is the limiting value
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for another (user) limit which is set in mq_open invocation. This attribute of
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a queue must be less or equal then msg_max.
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/proc/sys/fs/mqueue/msgsize_max is a read/write file for setting/getting the
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maximum message size value (it is every message queue's attribute set during
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its creation).
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4. /proc/sys/fs/epoll - Configuration options for the epoll interface
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--------------------------------------------------------
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This directory contains configuration options for the epoll(7) interface.
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max_user_instances
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------------------
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This is the maximum number of epoll file descriptors that a single user can
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have open at a given time. The default value is 128, and should be enough
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for normal users.
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max_user_watches
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----------------
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Every epoll file descriptor can store a number of files to be monitored
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for event readiness. Each one of these monitored files constitutes a "watch".
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This configuration option sets the maximum number of "watches" that are
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allowed for each user.
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Each "watch" costs roughly 90 bytes on a 32bit kernel, and roughly 160 bytes
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on a 64bit one.
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The current default value for max_user_watches is the 1/32 of the available
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low memory, divided for the "watch" cost in bytes.
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@ -1,5 +1,6 @@
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Documentation for /proc/sys/kernel/* kernel version 2.2.10
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(c) 1998, 1999, Rik van Riel <riel@nl.linux.org>
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(c) 2009, Shen Feng<shen@cn.fujitsu.com>
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For general info and legal blurb, please look in README.
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@ -18,6 +19,7 @@ Currently, these files might (depending on your configuration)
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show up in /proc/sys/kernel:
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- acpi_video_flags
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- acct
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- auto_msgmni
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- core_pattern
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- core_uses_pid
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- ctrl-alt-del
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@ -33,6 +35,7 @@ show up in /proc/sys/kernel:
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- msgmax
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- msgmnb
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- msgmni
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- nmi_watchdog
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- osrelease
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- ostype
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- overflowgid
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@ -40,6 +43,7 @@ show up in /proc/sys/kernel:
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- panic
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- pid_max
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- powersave-nap [ PPC only ]
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- panic_on_unrecovered_nmi
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- printk
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- randomize_va_space
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- real-root-dev ==> Documentation/initrd.txt
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@ -55,6 +59,7 @@ show up in /proc/sys/kernel:
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- sysrq ==> Documentation/sysrq.txt
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- tainted
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- threads-max
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- unknown_nmi_panic
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- version
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==============================================================
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@ -381,3 +386,51 @@ can be ORed together:
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512 - A kernel warning has occurred.
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1024 - A module from drivers/staging was loaded.
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==============================================================
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auto_msgmni:
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Enables/Disables automatic recomputing of msgmni upon memory add/remove or
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upon ipc namespace creation/removal (see the msgmni description above).
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Echoing "1" into this file enables msgmni automatic recomputing.
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Echoing "0" turns it off.
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auto_msgmni default value is 1.
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==============================================================
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nmi_watchdog:
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Enables/Disables the NMI watchdog on x86 systems. When the value is non-zero
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the NMI watchdog is enabled and will continuously test all online cpus to
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determine whether or not they are still functioning properly. Currently,
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passing "nmi_watchdog=" parameter at boot time is required for this function
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to work.
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If LAPIC NMI watchdog method is in use (nmi_watchdog=2 kernel parameter), the
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NMI watchdog shares registers with oprofile. By disabling the NMI watchdog,
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oprofile may have more registers to utilize.
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==============================================================
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unknown_nmi_panic:
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The value in this file affects behavior of handling NMI. When the value is
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non-zero, unknown NMI is trapped and then panic occurs. At that time, kernel
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debugging information is displayed on console.
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NMI switch that most IA32 servers have fires unknown NMI up, for example.
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If a system hangs up, try pressing the NMI switch.
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==============================================================
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panic_on_unrecovered_nmi:
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The default Linux behaviour on an NMI of either memory or unknown is to continue
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operation. For many environments such as scientific computing it is preferable
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that the box is taken out and the error dealt with than an uncorrected
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parity/ECC error get propogated.
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A small number of systems do generate NMI's for bizarre random reasons such as
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power management so the default is off. That sysctl works like the existing
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panic controls already in that directory.
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@ -0,0 +1,174 @@
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Documentation for /proc/sys/net/* kernel version 2.4.0-test11-pre4
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(c) 1999 Terrehon Bowden <terrehon@pacbell.net>
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Bodo Bauer <bb@ricochet.net>
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(c) 2000 Jorge Nerin <comandante@zaralinux.com>
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(c) 2009 Shen Feng <shen@cn.fujitsu.com>
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For general info and legal blurb, please look in README.
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==============================================================
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This file contains the documentation for the sysctl files in
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/proc/sys/net and is valid for Linux kernel version 2.4.0-test11-pre4.
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The interface to the networking parts of the kernel is located in
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/proc/sys/net. The following table shows all possible subdirectories.You may
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see only some of them, depending on your kernel's configuration.
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Table : Subdirectories in /proc/sys/net
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..............................................................................
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Directory Content Directory Content
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core General parameter appletalk Appletalk protocol
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unix Unix domain sockets netrom NET/ROM
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802 E802 protocol ax25 AX25
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ethernet Ethernet protocol rose X.25 PLP layer
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ipv4 IP version 4 x25 X.25 protocol
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ipx IPX token-ring IBM token ring
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bridge Bridging decnet DEC net
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ipv6 IP version 6
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..............................................................................
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1. /proc/sys/net/core - Network core options
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-------------------------------------------------------
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rmem_default
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------------
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The default setting of the socket receive buffer in bytes.
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rmem_max
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--------
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The maximum receive socket buffer size in bytes.
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wmem_default
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------------
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The default setting (in bytes) of the socket send buffer.
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wmem_max
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--------
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The maximum send socket buffer size in bytes.
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message_burst and message_cost
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------------------------------
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These parameters are used to limit the warning messages written to the kernel
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log from the networking code. They enforce a rate limit to make a
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denial-of-service attack impossible. A higher message_cost factor, results in
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fewer messages that will be written. Message_burst controls when messages will
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be dropped. The default settings limit warning messages to one every five
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seconds.
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warnings
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--------
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This controls console messages from the networking stack that can occur because
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of problems on the network like duplicate address or bad checksums. Normally,
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this should be enabled, but if the problem persists the messages can be
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disabled.
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netdev_budget
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-------------
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Maximum number of packets taken from all interfaces in one polling cycle (NAPI
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poll). In one polling cycle interfaces which are registered to polling are
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probed in a round-robin manner. The limit of packets in one such probe can be
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set per-device via sysfs class/net/<device>/weight .
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netdev_max_backlog
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------------------
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Maximum number of packets, queued on the INPUT side, when the interface
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receives packets faster than kernel can process them.
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optmem_max
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----------
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Maximum ancillary buffer size allowed per socket. Ancillary data is a sequence
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of struct cmsghdr structures with appended data.
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2. /proc/sys/net/unix - Parameters for Unix domain sockets
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-------------------------------------------------------
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There are only two files in this subdirectory. They control the delays for
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deleting and destroying socket descriptors.
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3. /proc/sys/net/ipv4 - IPV4 settings
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-------------------------------------------------------
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Please see: Documentation/networking/ip-sysctl.txt and ipvs-sysctl.txt for
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descriptions of these entries.
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4. Appletalk
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-------------------------------------------------------
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The /proc/sys/net/appletalk directory holds the Appletalk configuration data
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when Appletalk is loaded. The configurable parameters are:
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aarp-expiry-time
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----------------
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The amount of time we keep an ARP entry before expiring it. Used to age out
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old hosts.
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aarp-resolve-time
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-----------------
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The amount of time we will spend trying to resolve an Appletalk address.
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aarp-retransmit-limit
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---------------------
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The number of times we will retransmit a query before giving up.
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aarp-tick-time
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--------------
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Controls the rate at which expires are checked.
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The directory /proc/net/appletalk holds the list of active Appletalk sockets
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on a machine.
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The fields indicate the DDP type, the local address (in network:node format)
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the remote address, the size of the transmit pending queue, the size of the
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received queue (bytes waiting for applications to read) the state and the uid
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owning the socket.
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/proc/net/atalk_iface lists all the interfaces configured for appletalk.It
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shows the name of the interface, its Appletalk address, the network range on
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that address (or network number for phase 1 networks), and the status of the
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interface.
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/proc/net/atalk_route lists each known network route. It lists the target
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(network) that the route leads to, the router (may be directly connected), the
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route flags, and the device the route is using.
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5. IPX
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-------------------------------------------------------
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The IPX protocol has no tunable values in proc/sys/net.
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The IPX protocol does, however, provide proc/net/ipx. This lists each IPX
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socket giving the local and remote addresses in Novell format (that is
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network:node:port). In accordance with the strange Novell tradition,
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everything but the port is in hex. Not_Connected is displayed for sockets that
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are not tied to a specific remote address. The Tx and Rx queue sizes indicate
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the number of bytes pending for transmission and reception. The state
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indicates the state the socket is in and the uid is the owning uid of the
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socket.
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The /proc/net/ipx_interface file lists all IPX interfaces. For each interface
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it gives the network number, the node number, and indicates if the network is
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the primary network. It also indicates which device it is bound to (or
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Internal for internal networks) and the Frame Type if appropriate. Linux
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supports 802.3, 802.2, 802.2 SNAP and DIX (Blue Book) ethernet framing for
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IPX.
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The /proc/net/ipx_route table holds a list of IPX routes. For each route it
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gives the destination network, the router node (or Directly) and the network
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address of the router (or Connected) for internal networks.
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