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Re: [Xen-devel] Re: new netfront and occasional receive path lockup

To: "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>
Subject: Re: [Xen-devel] Re: new netfront and occasional receive path lockup
From: Gerald Turner <gturner@xxxxxxxxxx>
Date: Sun, 12 Sep 2010 19:12:30 -0700
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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In-reply-to: <D5AB6E638E5A3E4B8F4406B113A5A19A2A658C2F@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> (Dongxiao Xu's message of "Mon, 13 Sep 2010 08:54:52 +0800")
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"Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx> writes:

> Does this bug only happen when you launch multiple domUs?  I tried a
> single domU and could not catch the bug.

I've been working on this server for about two weeks, I hadn't noticed
the problem for the first week when I only had 3 domUs.  It started
happening when I added 10 more domUs.  The problem would happen quickly,
within 10 minutes, always affecting at least two domUs at random, and
affect more domUs over time.

Saturday I installed the updated driver with Jeremy's use_smartpoll
parameter, ran for 24 hours with smartpoll disabled, no problems.

Today I've been trying with smartpoll enabled.  It took an hour to
affect two domUs - noticibly longer than the behavior previous days
before installing your patch.  I still have 9 other domUs running with
smartpoll enabled, four hours uptime, I'm surprised they haven't been
affected yet.  Could there be another less-frequent race in

Gerald Turner  Email: gturner@xxxxxxxxxx  JID: gturner@xxxxxxxxxxxxxxxxx
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