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From: Martin KaFai Lau <kafai@fb.com>
To: Jovi Zhangwei <jovi@cloudflare.com>
Cc: Neal Cardwell <ncardwell@google.com>,
	Eric Dumazet <edumazet@google.com>,
	Netdev <netdev@vger.kernel.org>,
	David Miller <davem@davemloft.net>,
	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
	James Morris <jmorris@namei.org>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	Patrick McHardy <kaber@trash.net>,
	FB Kernel Team <kernel-team@fb.com>
Subject: Re: kernel warning in tcp_fragment
Date: Wed, 12 Aug 2015 20:45:28 -0700	[thread overview]
Message-ID: <20150813034528.GC2871239@devbig242.prn2.facebook.com> (raw)
In-Reply-To: <CADVnQy=-ADK-LVVhOC8Fs=z_1PiLjMSc4+z_qnKXu-wKx7Nq8g@mail.gmail.com>

On Mon, Aug 10, 2015 at 02:35:37PM -0400, Neal Cardwell wrote:
> On Mon, Aug 10, 2015 at 2:10 PM, Jovi Zhangwei <jovi@cloudflare.com> wrote:
> >
> > Ping?
> >
> > We saw a lot of this warnings in our production system. It would be
> > great appreciate if someone can give us the fix on this warnings. :)
> 
> What is your net.ipv4.tcp_mtu_probing setting? If 1, have you tried
> setting it to 0? 

Hi Jovi, If setting net.ipv4.tcp_mtu_probing=0 helps, can you give the
patch we posted earlier a try: https://patchwork.ozlabs.org/patch/481609/
It is the same patch that I pointed out earlier. You can click
on the download link.

We are currently using a similar patch while keeping net.ipv4.tcp_mtu_probing=1.

Thanks,
--Martin

  parent reply	other threads:[~2015-08-13  3:46 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-22 18:55 kernel warning in tcp_fragment Jovi Zhangwei
2015-07-27 19:08 ` Jovi Zhangwei
2015-07-27 23:19 ` Martin KaFai Lau
2015-07-31 18:04   ` Jovi Zhangwei
2015-08-10 18:10     ` Jovi Zhangwei
2015-08-10 18:35       ` Neal Cardwell
2015-08-10 21:53         ` Jovi Zhangwei
2015-08-13  3:45         ` Martin KaFai Lau [this message]
2015-08-13 23:05           ` Jovi Zhangwei
2015-09-01 23:02           ` Grant Zhang
2015-09-14 18:12             ` Martin KaFai Lau
     [not found]             ` <CABPcSqJMS3oYLbL=Ns71ciF_9rcZNuZ0VceV=noaLJgV=LTAQQ@mail.gmail.com>
2015-09-14 18:15               ` Neal Cardwell
     [not found]                 ` <CABPcSqJEoVAXk+PAZCWgD6LFV0Nxz7ON3CUuZZMgrcRQFLK44w@mail.gmail.com>
2015-10-19 10:57                   ` Jovi Zhangwei

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