On Sun, Jul 26, 2015 at 3:45 AM, Eric Dumazet <eric.duma...@gmail.com> wrote:
> From: Eric Dumazet <eduma...@google.com>
>
> While doing experiments with reordering resilience, we found
> linux senders were not able to send at full speed under reordering,
> because every incoming SACK was releasing one MSS.
>
> This patch removes the limitation, as we did for CWR state
> in commit a0ea700e409 ("tcp: tso: allow CA_CWR state in
> tcp_tso_should_defer()")
>
> Neal Cardwell had a concern about limited transmit so
> Yuchung conducted experiments on GFE and found nothing
> worth adding an extra check on fast path :
>
> if (icsk->icsk_ca_state == TCP_CA_Disorder &&
> tcp_sk(sk)->reordering == sysctl_tcp_reordering)
> goto send_now;
>
> Signed-off-by: Eric Dumazet <eduma...@google.com>
> Signed-off-by: Yuchung Cheng <ych...@google.com>
> Cc: Neal Cardwell <ncardw...@google.com>
Acked-by: Neal Cardwell <ncardw...@google.com>
Looks good to me. Thanks, Eric. And thanks, Yuchung, for running the experiment!
neal
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