netdev - Re: 3.10.0 network trace

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Message-ID: <CA+5PVA4YmFVy=02Py2+1=BP4MbcCrUKphk7w+0-ahvMPxygt_g@mail.gmail.com>
Date:	Wed, 11 Sep 2013 21:51:58 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	Michael Sterrett <michael@...rretts.net>,
	netdev <netdev@...r.kernel.org>,
	Neal Cardwell <ncardwell@...gle.com>,
	Nandita Dukkipati <nanditad@...gle.com>
Subject: Re: 3.10.0 network trace

On Wed, Sep 11, 2013 at 12:32 PM, Yuchung Cheng <ycheng@...gle.com> wrote:
> On Wed, Sep 11, 2013 at 5:49 AM, Josh Boyer <jwboyer@...oraproject.org> wrote:
>> On Sun, Jul 21, 2013 at 9:36 PM, Michael Sterrett <michael@...rretts.net> wrote:
>>> Since upgraded to 3.10.1 which exhibits the same issue (probably not
>>> surprising).
>>>
>>> sysctl net.ipv4.tcp_frto=0 net.ipv4.tcp_early_retrans=3 seems to take
>>> care of it.
>>
>> We're still getting reports of this with 3.10.10 in Fedora [1].  At
>> least one of the reporters has said those sysctl settings didn't help.
>>
>> Is there anything else that can be gathered to help track this down?
> since frto=0 didn't help, I suspect it's either a bug introduced in
> the tail loss probe patch 9b717a8d (tcp: TLP loss detection) or other
> changes related loss recovery.
>
> could you try disable TLP by
> sysctl net.ipv4.tcp_frto=0 net.ipv4.tcp_early_retrans=1
>
> if it still does not work. disable any form of early retransmit by
> sysctl net.ipv4.tcp_frto=0 net.ipv4.tcp_early_retrans=0

Thanks.  I've asked the people in the bug to try those settings.

> if you can test a custom build kernel, please try this debugging patch.

I'll get the patch included in a test build for the tomorrow as well.

josh
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