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| author | Eric Dumazet <dada1@cosmosbay.com> | 2007-02-09 15:44:52 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-02-10 23:20:29 -0800 |
| commit | 95f30b336b944e3e418f825044b4793d9e9aac09 (patch) | |
| tree | 4faf8cc7a061fdf7d85f94768ca1150f8580e700 /net/ethernet | |
| parent | 4768fbcbcfbbcacb785ae08eef33767a0b4fdcdd (diff) | |
| download | kernel_samsung_smdk4412-95f30b336b944e3e418f825044b4793d9e9aac09.tar.gz kernel_samsung_smdk4412-95f30b336b944e3e418f825044b4793d9e9aac09.tar.bz2 kernel_samsung_smdk4412-95f30b336b944e3e418f825044b4793d9e9aac09.zip | |
[UDP]: UDP can use sk_hash to speedup lookups
In a prior patch, I introduced a sk_hash field (__sk_common.skc_hash) to let
tcp lookups use one cache line per unmatched entry instead of two.
We can also use sk_hash to speedup UDP part as well. We store in sk_hash the
hnum value, and use sk->sk_hash (same cache line than 'next' pointer),
instead of inet->num (different cache line)
Note : We still have a false sharing problem for SMP machines, because
sock_hold(sock) dirties the cache line containing the 'next' pointer. Not
counting the udp_hash_lock rwlock. (did someone mentioned RCU ? :) )
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ethernet')
0 files changed, 0 insertions, 0 deletions