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[Xen-devel] xm sched-credit2 - changing weight of dom0 freezes machine

To: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxxxxx>
Subject: [Xen-devel] xm sched-credit2 - changing weight of dom0 freezes machine
From: John Weekes <lists.xen@xxxxxxxxxxxxxxxxxx>
Date: Mon, 28 Mar 2011 00:30:08 -0700
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In testing credit2, I have observed that changing the weight of dom0 freezes a machine on RELEASE-4.1.0. Executing this command immediately causes a freeze, for instance:

xm sched-credit2 -d 0 -w 256

This is with the latest stable-2.6.32 (2.6.32.35-gdf3a556). I haven't tested with credit2 previously, so I don't know how long this problem has existed.

I also saw a different freeze event after starting up 20 or so domains on one machine. There were no messages in the xend.log or /var/log/messages after the freeze -- the machine just stopped responding, as it does when trying to change the dom0 weight. How can I effectively debug this if I see it happen again?

-John

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