linux-kernel - Re: [PATCH -rt DO NOT APPLY] Fix for tg3 networking lockup

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Date:	Thu, 3 Aug 2006 13:28:36 -0400
From:	Theodore Tso <tytso@....edu>
To:	"Randy.Dunlap" <rdunlap@...otime.net>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	davem@...emloft.net, mchan@...adcom.com
Subject: Re: [PATCH -rt DO NOT APPLY] Fix for tg3 networking lockup

On Thu, Aug 03, 2006 at 09:49:17AM -0700, Randy.Dunlap wrote:
> Interesting.  On my Dell D610 notebook with tg3 and vpn,
> I have to ping a server on the vpn to keep it alive, otherwise
> it disappears soon and I have to restart the vpn.  Of course,
> this could just be the vpn or some other software problem
> instead of a tg3 problem.

That sounds almost certainly like a VPN problem.  The tg3_timer() code
wakes up every second or tenth of a second (depending on which mode
you're in) and takes care of keeping the tg3 hardware mollified.  On a
standard kernel, this shouldn't ever be an issue.  For the -rt kernel,
this problem only shows up if you have enough tasks running at
rtprio's above the rtprio of the softirq-timer for long enough that
tg3 chip gets angry....

						- Ted
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