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author | Eric Dumazet <dada1@cosmosbay.com> | 2007-11-07 10:40:20 (GMT) |
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committer | David S. Miller <davem@sunset.davemloft.net> | 2007-11-07 12:15:11 (GMT) |
commit | 230140cffa7feae90ad50bf259db1fa07674f3a7 (patch) | |
tree | 815472add31606423a508a17806b7884f0ab3e2e /.mailmap | |
parent | efac52762b1e3fe3035d29e82d8ee1aebc45e4a7 (diff) | |
download | linux-fsl-qoriq-230140cffa7feae90ad50bf259db1fa07674f3a7.tar.xz |
[INET]: Remove per bucket rwlock in tcp/dccp ehash table.
As done two years ago on IP route cache table (commit
22c047ccbc68fa8f3fa57f0e8f906479a062c426) , we can avoid using one
lock per hash bucket for the huge TCP/DCCP hash tables.
On a typical x86_64 platform, this saves about 2MB or 4MB of ram, for
litle performance differences. (we hit a different cache line for the
rwlock, but then the bucket cache line have a better sharing factor
among cpus, since we dirty it less often). For netstat or ss commands
that want a full scan of hash table, we perform fewer memory accesses.
Using a 'small' table of hashed rwlocks should be more than enough to
provide correct SMP concurrency between different buckets, without
using too much memory. Sizing of this table depends on
num_possible_cpus() and various CONFIG settings.
This patch provides some locking abstraction that may ease a future
work using a different model for TCP/DCCP table.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '.mailmap')
0 files changed, 0 insertions, 0 deletions