netdev - Re: 2.6.26/tg3 ping roundtrip times

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Message-ID: <1219166962.13090.12.camel@HP1>
Date:	Tue, 19 Aug 2008 10:29:22 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"David Miller" <davem@...emloft.net>
cc:	"mh+linux-kernel@...schlus.de" <mh+linux-kernel@...schlus.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	mcarlson@...adcom.com
Subject: Re: 2.6.26/tg3 ping roundtrip times > 2000 ms on local network


On Tue, 2008-08-19 at 13:20 -0700, David Miller wrote:
> From: Marc Haber <mh+linux-kernel@...schlus.de>
> Date: Tue, 19 Aug 2008 19:20:19 +0200
> 
> [ netdev added to CC: ]
> 
> > I have one HP DL 140 G1 running with Debian stable and a
> > locally-built, vanilla kernel. With 2.6.25.11, everything is fine.
> >
> > But, after updating to 2.6.26.2, I noticed that pinging the host on
> > the local ethernet sometimes (e.g. several times a minute, but not
> > always) results in a round-trip time of larger than two seconds. The
> > packets are not lost though, they're only severly delayed. For an ssh
> > session to the host, this feels like somebody rocking a bad network
> > connector. The same behavior is visible with 2.6.26 and 2.6.26.1.
> >
> > Going back to 2.6.25.11 immediately fixes the issue for me.
> >
> > Syslog doesn't say anything conspicious, unfortunately. As I don't
> > have local access to the box, I cannot say whether it's only the
> > network that freezes or whether it's the entire box.
> >
> > Does it make sense to test any later 2.6.25.x kernel, or is there any
> > post-2.6.26 patch available that may fix the issue for me?
> >
> > Strangely, another DL 140 from the same charge runs just fine with
> > 2.6.26.2.
> >

The may be the 2.5 second polling that was mistakenly added to the code
instead of the intended 2.5 msec.

It has been fixed a few days ago in the net-2.6 tree:

tg3: Fix firmware event timeouts

and it should be in Linus' tree very soon.  This reminds us to send the
same patch to -stable.

Thanks.


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