netdev - Re: Network hangs on current git kernel

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Date:	Sat, 2 Jun 2012 19:16:58 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Francois Romieu <romieu@...zoreil.com>, netdev@...r.kernel.org
Subject: Re: Network hangs on current git kernel

On 2012.06.02 at 18:34 +0200, Markus Trippelsdorf wrote:
> On 2012.06.02 at 17:48 +0200, Eric Dumazet wrote:
> > On Sat, 2012-06-02 at 13:23 +0200, Markus Trippelsdorf wrote:
> > > On 2012.06.02 at 13:15 +0200, Eric Dumazet wrote:
> > > > On Sat, 2012-06-02 at 12:57 +0200, Francois Romieu wrote:
> > > > > Eric Dumazet <eric.dumazet@...il.com> :
> > > > > > On Sat, 2012-06-02 at 10:25 +0200, Markus Trippelsdorf wrote:
> > > > > [hang]
> > > > > > Maybe tell us what NIC it is, that sort of things...
> > > > > 
> > > > > As well as 'ip -s link' and complete dmesg from boot.
> > > > > Kernel .config may be.
> > > > 
> > > > yes, and "netstat -s" is always useful
> > > 
> > > It's an ATL1E NIC. The kernel config is attached.
> > 
> > Driver tx completion is buggy, but it should hang forever...
> > 
> > If you ping your local gateway, you also have 'hangs' ?
> 
> Will keep an eye on that.
> After all this could well be just a buggy router, that broke in the last
> few days by coincidence...

And indeed it must be a buggy router:

(all pings were collected in parallel)

--- heise.de ping statistics ---
128 packets transmitted, 110 received, 14% packet loss, time 127232ms
rtt min/avg/max/mdev = 21.684/23.611/49.691/3.211 ms

--- 192.168.1.1 (local router) ping statistics ---
126 packets transmitted, 126 received, 0% packet loss, time 125004ms
rtt min/avg/max/mdev = 0.095/0.222/0.336/0.060 ms

--- localhost ping statistics ---
127 packets transmitted, 127 received, 0% packet loss, time 126001ms
rtt min/avg/max/mdev = 0.009/0.029/0.065/0.011 ms

Sorry for the noise!

-- 
Markus
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