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(parent: a9b204d) | patch
tcp: tsq: add a shortcut in tcp_small_queue_check()
authorEric Dumazet <edumazet@google.com>
Sat, 3 Dec 2016 19:14:54 +0000 (11:14 -0800)
committerDavid S. Miller <davem@davemloft.net>
Mon, 5 Dec 2016 18:32:23 +0000 (13:32 -0500)
commit75eefc6c59fd2c5f1ab95a3a113c217237d12a31
treef5559676f497c4e30b71f58e9df43a944da88641tree | snapshot
parenta9b204d1564702b704ad6fe74f10a102c7b87ba3commit | diff
tcp: tsq: add a shortcut in tcp_small_queue_check()

Always allow the two first skbs in write queue to be sent,
regardless of sk_wmem_alloc/sk_pacing_rate values.

This helps a lot in situations where TX completions are delayed either
because of driver latencies or softirq latencies.

Test is done with no cache line misses.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp_output.c diff | blob | history
Domain: System / Kernel;