netdev - Re: scp stalls mysteriously

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Message-ID: <alpine.DEB.2.00.0912012220570.1904@melkinpaasi.cs.helsinki.fi>
Date:	Tue, 1 Dec 2009 22:27:01 +0200 (EET)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Frederic Leroy <fredo@...rox.org>
cc:	Netdev <netdev@...r.kernel.org>, Asdo <asdo@...ftmail.org>
Subject: Re: scp stalls mysteriously

On Tue, 1 Dec 2009, Frederic Leroy wrote:

> Le Mon, 30 Nov 2009 23:37:56 +0200 (EET),
> "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> a écrit :
> 
> > On Mon, 30 Nov 2009, Frederic Leroy wrote:
> >
> > Could you try btw to disable frto (set tcp_frto sysctl to zero), in
> > theory it could cause zero cwnd if something else is wrong too (I
> > haven't yet read them all through so there might be other places
> > where a zero cwnd can be set). Also I'm interested what happens if
> > you disable timestamps, is the problem still reproducable.
> 
> I made 3 new traces and put it in the usual place.
> One with frto set to 0, one just after with frto set to 2.
> 
> And the last with timestamp disabled. 
> 
> All stream has stalled.

Thanks, I'll hopefully have some time tomorrow to go through all the new 
ones. In the meantime, can you provide your tso configuration on houba 
(ethtool -k dev). If tso is on it might be worth to try without it 
(set with -K), however, I don't expect it to change anything. Also,
I wonder if you have had some working (past) kernel version?

No need for additional traces atm, I'll get back to this once I've gone 
through the logs.

-- 
 i.