netdev - Re: [PATCH v2] tcp: tsq: restore minimal amount of queueing

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Message-ID: <8738n0ngq3.fsf@natisbad.org>
Date:	Wed, 13 Nov 2013 22:18:12 +0100
From:	arno@...isbad.org (Arnaud Ebalard)
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Sujith Manoharan <sujith@...jith.org>,
	Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org,
	Felix Fietkau <nbd@...nwrt.org>
Subject: Re: [PATCH v2] tcp: tsq: restore minimal amount of queueing

Hi Eric,

Eric Dumazet <eric.dumazet@...il.com> writes:

> From: Eric Dumazet <edumazet@...gle.com>
>
> After commit c9eeec26e32e ("tcp: TSQ can use a dynamic limit"), several
> users reported throughput regressions, notably on mvneta and wifi
> adapters.
>
> 802.11 AMPDU requires a fair amount of queueing to be effective.
>
> This patch partially reverts the change done in tcp_write_xmit()
> so that the minimal amount is sysctl_tcp_limit_output_bytes.

I just tested the fix on current linux tree with the same setup
on which I observed the regression: it also fixes it on my side
on my RN102. Thanks for the quick fix, Eric. 

Cheers,

a+
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