From: Stephen Hemminger <shemminger@linux-foundation.org>
To: Tony Battersby <tonyb@cybernetics.com>
Cc: netdev@vger.kernel.org
Subject: Re: BUG: sky2: hw csum failure with dual-port copper NIC on SMP
Date: Tue, 13 Nov 2007 15:27:55 -0800 [thread overview]
Message-ID: <20071113152755.4d55c86a@freepuppy.rosehill> (raw)
In-Reply-To: <473A2BC8.7000909@cybernetics.com>
On Tue, 13 Nov 2007 17:57:12 -0500
Tony Battersby <tonyb@cybernetics.com> wrote:
> Stephen Hemminger wrote:
> > I can reproduce the problem under load with only a single port on 2.6.23.
> > I haven't been able to reproduce it on 2.6.24-rc2 (latest) but that maybe
> > because of either insufficient stress or another bug fix correcting the
> > problem. There is an issue with Yukon XL updating the receive status index
> > before updating the receive status structure, that is now fixed in 2.6.24.
> > The fix is:
> >
> > commit ab5adecb2d02f3688719dfb5936a82833fcc3955
> > Author: Stephen Hemminger <shemminger@linux-foundation.org>
> > Date: Mon Nov 5 15:52:09 2007 -0800
> >
> > sky2: status ring race fix
> >
> > The D-Link PCI-X board (and maybe others) can lie about status
> > ring entries. It seems it will update the register for last status
> > index before completing the DMA for the ring entry. To avoid reading
> > stale data, zap the old entry and check.
> >
> > Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
> > Signed-off-by: Jeff Garzik <jeff@garzik.org>
> The kernel I tested (2.6.24-rc2-git3) has this patch in it already.
> Perhaps that is why the problem happens less frequently with that
> kernel, but it didn't fix it entirely.
>
> Do you want the test program I am using? It is a pretty basic
> send()/recv() program, ~650 lines of C.
>
> Tony
>
Not really, iperf drives the problem fine.
--
Stephen Hemminger <shemminger@linux-foundation.org>
next prev parent reply other threads:[~2007-11-13 23:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-13 17:51 BUG: sky2: hw csum failure with dual-port copper NIC on SMP Tony Battersby
2007-11-13 22:14 ` Stephen Hemminger
2007-11-13 22:57 ` Tony Battersby
2007-11-13 23:27 ` Stephen Hemminger [this message]
2007-11-14 15:37 ` Tony Battersby
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