netdev - Re: Socket buffer sizes with autotuning

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Message-ID: <1e41a3230804240932u510609beh8fb577baaadeb9bd@mail.gmail.com>
Date:	Thu, 24 Apr 2008 09:32:38 -0700
From:	"John Heffner" <johnwheffner@...il.com>
To:	"Jerry Chu" <hkchu@...gle.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Socket buffer sizes with autotuning

On Wed, Apr 23, 2008 at 4:29 PM, Jerry Chu <hkchu@...gle.com> wrote:
>
> I've been seeing the same problem here and am trying to fix it.
>  My fix is to not count those pkts still in the host queue as "prior_in_flight"
>  when feeding the latter to tcp_cong_avoid(). This should cause
>  tcp_is_cwnd_limited() test to fail when the previous in_flight build-up
>  is all due to the large host queue, and stop the cwnd to grow beyond
>  what's really necessary.

Sounds like a useful optimization.  Do you have a patch?

  -John
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