netdev - Re: v3.8.5: "TCP: snd_cwnd is nul, please report this bug."

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Message-ID: <874ndg71yg.fsf@nemi.mork.no>
Date:	Sun, 02 Jun 2013 21:21:59 +0200
From:	Bjørn Mork <bjorn@...k.no>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
	Yuchung Cheng <ycheng@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>
Subject: Re: v3.8.5: "TCP: snd_cwnd is nul, please report this bug."

Eric Dumazet <eric.dumazet@...il.com> writes:
> On Sun, 2013-06-02 at 12:19 +0200, Bjørn Mork wrote:
>
>> Just FYI, in case you wondered what happened here...
>> 
>> I've been running with the debug patch since you sent it to me, and
>> still is.  But the warning has not yet reappeared.
>> 
>> I'll continue using the patch for a while, but will eventually drop it
>> if the warning cannot be reproduced in another couple of weeks time.
>> There have been a few fixes to iwlwifi in the meantime, and I do not
>> rule out the possibility that some of these removed the triggering
>> event.
>> 
>
> What exact tree are you running ?

I am currently testing the mainline v3.10-rcX releases.  I.e. v3.10-rc4
right now.

> F-RTO code was replaced by Yuching Cheng, and it might very well have
> solved these issues.
>
> commit e33099f96d99c391b3325caa9c44258de04aae86 
> ("tcp: implement RFC5682 F-RTO")
>
> commit ab42d9ee3d215ab74a49818ffc53771a88ce7ddf
> ("tcp: refactor CA_Loss state processing")
>
> commit 9b44190dc114c1720b34975b5bfc65aece112ced
> ("tcp: refactor F-RTO")

Right.

I'll assume the problem is fixed then.  Will drop the debug patch for
now, but resurrect it and let you know if I ever see the warning again.


Bjørn
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