netdev - Re: performance regression on HiperSockets depending on MTU size

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Message-ID: <k91m5l$77a$1@ger.gmane.org>
Date:	Tue, 27 Nov 2012 06:21:42 +0000 (UTC)
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: performance regression on HiperSockets depending on MTU size

On Mon, 26 Nov 2012 at 16:12 GMT, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Hi Frank, thanks for this report.
>
> You could tweak tcp_limit_output_bytes, but IMO the root of the problem
> is in the driver itself.
>
> For example, I had to change mlx4 driver for the same problem : Make
> sure a TX packet can be "TX completed" in a short amount of time.
>
> In the case of mlx4, the wait time was 128 us, but I suspect on your
> case its more like an infinite time or several ms.
>  
> The driver is delaying the free of TX skb by a fixed amount of time,
> or relies on following transmits to perform the TX completion
>

Eric,

Do you have a full list of such commits? I am trying to backport TSQ
to 2.6.32, and of course I don't want to miss these commits either.

Thanks!

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