netdev - Re: [PATCH net-next] tcp: tso: allow deferring under reordering state

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Message-Id: <20150727.012336.2241103927980627863.davem@davemloft.net>
Date:	Mon, 27 Jul 2015 01:23:36 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, ncardwell@...gle.com, ycheng@...gle.com
Subject: Re: [PATCH net-next] tcp: tso: allow deferring under reordering
 state

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sun, 26 Jul 2015 09:45:24 +0200

> From: Eric Dumazet <edumazet@...gle.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 <edumazet@...gle.com>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>

Applied.
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