From: Josh Boyer <jwboyer@fedoraproject.org>
To: Yuchung Cheng <ycheng@google.com>
Cc: Michael Sterrett <michael@sterretts.net>,
netdev <netdev@vger.kernel.org>,
Neal Cardwell <ncardwell@google.com>,
Nandita Dukkipati <nanditad@google.com>
Subject: Re: 3.10.0 network trace
Date: Wed, 11 Sep 2013 21:51:58 -0400 [thread overview]
Message-ID: <CA+5PVA4YmFVy=02Py2+1=BP4MbcCrUKphk7w+0-ahvMPxygt_g@mail.gmail.com> (raw)
In-Reply-To: <CAK6E8=eRZQnPeVPpzcdzUtLqr0n2kjUQ2_JRE8_WXn3sSV2y9A@mail.gmail.com>
On Wed, Sep 11, 2013 at 12:32 PM, Yuchung Cheng <ycheng@google.com> wrote:
> On Wed, Sep 11, 2013 at 5:49 AM, Josh Boyer <jwboyer@fedoraproject.org> wrote:
>> On Sun, Jul 21, 2013 at 9:36 PM, Michael Sterrett <michael@sterretts.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
prev parent reply other threads:[~2013-09-12 1:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CA+rTEUPfP8ouJHbaFrO=-zktg2D06kYgXOq-LnmyKbbEzj-TmA@mail.gmail.com>
2013-07-12 20:44 ` Fwd: 3.10.0 network trace Michael Sterrett
2013-07-12 21:18 ` Yuchung Cheng
2013-07-12 21:33 ` Michael Sterrett
2013-07-12 21:39 ` Yuchung Cheng
2013-07-13 21:10 ` Michael Sterrett
2013-07-21 6:04 ` Yuchung Cheng
2013-07-22 1:36 ` Michael Sterrett
2013-09-11 12:49 ` Josh Boyer
2013-09-11 16:32 ` Yuchung Cheng
2013-09-12 1:51 ` Josh Boyer [this message]
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