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| author |   Eric Dumazet <edumazet@google.com> | 2012-08-07 02:19:56 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-08-07 16:24:55 -0700 |
| commit | 425f09ab7d1c9da6ca4137dd639cb6fe3f8a88f3 (patch) | |
| tree | 49c586d8025f671a8e47415f4364bfb818534569 /net/bridge/br_stp_timer.c | |
| parent | documentation: dt: bindings: cpsw: fixing the examples for directly using it in dts file (diff) | |
| download | linux-dev-425f09ab7d1c9da6ca4137dd639cb6fe3f8a88f3.tar.xz linux-dev-425f09ab7d1c9da6ca4137dd639cb6fe3f8a88f3.zip | |
net: output path optimizations
1) Avoid dirtying neighbour's confirmed field.
TCP workloads hits this cache line for each incoming ACK.
Lets write n->confirmed only if there is a jiffie change.
2) Optimize neigh_hh_output() for the common Ethernet case, were
hh_len is less than 16 bytes. Replace the memcpy() call
by two inlined 64bit load/stores on x86_64.
Bench results using udpflood test, with -C option (MSG_CONFIRM flag
added to sendto(), to reproduce the n->confirmed dirtying on UDP)
24 threads doing 1.000.000 UDP sendto() on dummy device, 4 runs.
before : 2.247s, 2.235s, 2.247s, 2.318s
after : 1.884s, 1.905s, 1.891s, 1.895s
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions