[NET]: Force a cache line split in hh_cache in SMP.
hh_lock was converted from rwlock to seqlock by Stephen. To have a 100% benefit of this change, I suggest to place read mostly fields of hh_cache in a separate cache line, because hh_refcnt may be changed quite frequently on some busy machines. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -193,7 +193,14 @@ struct hh_cache
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{
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struct hh_cache *hh_next; /* Next entry */
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atomic_t hh_refcnt; /* number of users */
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__be16 hh_type; /* protocol identifier, f.e ETH_P_IP
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/*
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* We want hh_output, hh_len, hh_lock and hh_data be a in a separate
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* cache line on SMP.
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* They are mostly read, but hh_refcnt may be changed quite frequently,
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* incurring cache line ping pongs.
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*/
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__be16 hh_type ____cacheline_aligned_in_smp;
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/* protocol identifier, f.e ETH_P_IP
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* NOTE: For VLANs, this will be the
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* encapuslated type. --BLG
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*/
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