From: Cong Wang <xiyou.wangcong@gmail.com>
To: netdev@vger.kernel.org
Subject: Re: performance regression on HiperSockets depending on MTU size
Date: Tue, 27 Nov 2012 06:21:42 +0000 (UTC) [thread overview]
Message-ID: <k91m5l$77a$1@ger.gmane.org> (raw)
In-Reply-To: 1353946351.30446.1779.camel@edumazet-glaptop
On Mon, 26 Nov 2012 at 16:12 GMT, Eric Dumazet <eric.dumazet@gmail.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!
next prev parent reply other threads:[~2012-11-27 6:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-26 15:32 performance regression on HiperSockets depending on MTU size Frank Blaschka
2012-11-26 16:12 ` Eric Dumazet
2012-11-27 6:21 ` Cong Wang [this message]
2012-11-27 6:46 ` Eric Dumazet
2012-11-28 5:31 ` Cong Wang
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