netdev - Re: Fwd: TCP fragmentation broken in 3.6-rc ?

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Date:	Mon, 20 Aug 2012 17:14:30 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sylvain Munaut <s.munaut@...tever-company.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Fwd: TCP fragmentation broken in 3.6-rc ?

On Mon, 2012-08-20 at 16:56 +0200, Sylvain Munaut wrote:
> Hi,
> 
> It seems somehow something was broken in 3.6-rc.
> I'm not sure exactly what though. The symptoms are:
> 
>  - TCP connection get "stuck" with data in send queue when doing
> "large" transfers ( like typing 'ps ax' on a ssh connection )
>  - Only happens on path where the PMTU is lower than the MTU of the interface
>  - Is not present right after boot, it only appears 10-20min after
> boot or so. (and that's inside the _same_ TCP connection, it works
> fine at first and then in the same ssh session, it'll get stuck)
>  - Definitely seems related to fragments somehow since I see a router
> sending ICMP message saying fragmentation is needed.
>  - Exact same setup works fine with kernel 3.5.1
> 
> Cheers,

Could you make sure its not a pfmemalloc problem, by applying following
patch :

https://lkml.org/lkml/2012/8/20/182

Thanks


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