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authorEric Dumazet <edumazet@google.com>2012-07-20 05:45:50 +0000
committerDavid S. Miller <davem@davemloft.net>2012-07-20 10:59:41 -0700
commit6f458dfb409272082c9bfa412f77ff2fc21c626f (patch)
tree7475cd12eb01023b9852cbc957080b9aa7cfdc64 /scripts
parent9dc274151a548ffd215caecec5a8872db8799447 (diff)
tcp: improve latencies of timer triggered events
Modern TCP stack highly depends on tcp_write_timer() having a small latency, but current implementation doesn't exactly meet the expectations. When a timer fires but finds the socket is owned by the user, it rearms itself for an additional delay hoping next run will be more successful. tcp_write_timer() for example uses a 50ms delay for next try, and it defeats many attempts to get predictable TCP behavior in term of latencies. Use the recently introduced tcp_release_cb(), so that the user owning the socket will call various handlers right before socket release. This will permit us to post a followup patch to address the tcp_tso_should_defer() syndrome (some deferred packets have to wait RTO timer to be transmitted, while cwnd should allow us to send them sooner) Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Tom Herbert <therbert@google.com> Cc: Yuchung Cheng <ycheng@google.com> Cc: Neal Cardwell <ncardwell@google.com> Cc: Nandita Dukkipati <nanditad@google.com> Cc: H.K. Jerry Chu <hkchu@google.com> Cc: John Heffner <johnwheffner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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