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| author | Eric Dumazet <edumazet@google.com> | 2015-05-13 03:24:50 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-05-15 00:49:06 +0300 |
| commit | 91dd93f956b9ea9ecf47fd4b9acd2d2e7f980303 (patch) | |
| tree | 1144107d6ac2f98703f314450ebb866baf6bcbad /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | be346ffaad9bc354075fba5cd009fc4519abdd64 (diff) | |
| download | linux-91dd93f956b9ea9ecf47fd4b9acd2d2e7f980303.tar.xz | |
netlink: move nl_table in read_mostly section
netlink sockets creation and deletion heavily modify nl_table_users
and nl_table_lock.
If nl_table is sharing one cache line with one of them, netlink
performance is really bad on SMP.
ffffffff81ff5f00 B nl_table
ffffffff81ff5f0c b nl_table_users
Putting nl_table in read_mostly section increased performance
of my open/delete netlink sockets test by about 80 %
This came up while diagnosing a getaddrinfo() problem.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions