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Subject: Re: 2.6.17: slow (as hell) tcp inbound transfers
From: Brice Figureau <brice+lklm@daysofwonder.com>
To: Con Kolivas <kernel@kolivas.org>
Cc: linux-kernel@vger.kernel.org,
       Vincent Vanackere <vincent.vanackere@gmail.com>
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Date: Mon, 19 Jun 2006 17:52:43 +0200
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On Tue, 2006-06-20 at 01:15 +1000, Con Kolivas wrote:
> On Tuesday 20 June 2006 00:59, Brice Figureau wrote:
> > On Mon, 2006-06-19 at 16:17 +0200, Vincent Vanackere wrote:
> > > On 6/19/06, Brice Figureau <brice+lklm@daysofwonder.com> wrote:
> > > > It seems that TCP inbound transfers (using either curl, or scp) are
> > > > really slow except when issued on our gigabit LAN.
> > >
> > > Could you try the following to see if it cures your problem ?
> > >
> > > echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
> >
> > Yes, that fixed it:
> > [snipped]
> > Did something has changed between 2.6.16 and 2.6.17 regarding TCP window
> > scaling ?
> >
> > I remember a discussion on lklm aroung 2.6.7 or so that finally ended as
> > a bug in a firewall that wasn't handling TCP window scaling gracefully.
> > That's certainly my case, I'll will have a look to that.
> 
> See:
> 
> http://kerneltrap.org/node/6723

Thanks for the pointer and sorry for the noise.
-- 
Brice Figureau