tcp: tsq: add shortcut in tcp_tasklet_func()

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Under high stress, I've seen tcp_tasklet_func() consuming
~700 usec, handling ~150 tcp sockets.

By setting TCP_TSQ_DEFERRED in tcp_wfree(), we give a chance
for other cpus/threads entering tcp_write_xmit() to grab it,
allowing tcp_tasklet_func() to skip sockets that already did
an xmit cycle.

In the future, we might give to ACK processing an increased
budget to reduce even more tcp_tasklet_func() amount of work.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric Dumazet 2016-12-03 11:14:52 -08:00 • committed by David S. Miller

parent 408f0a6c21

commit b223feb9de

1 changed files with 12 additions and 10 deletions

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net/ipv4/tcp_output.c

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