* xm sched-credit2 - changing weight of dom0 freezes machine
@ 2011-03-28 7:30 John Weekes
2011-03-28 8:04 ` Pasi Kärkkäinen
0 siblings, 1 reply; 2+ messages in thread
From: John Weekes @ 2011-03-28 7:30 UTC (permalink / raw)
To: xen-devel@lists.xensource.com, Keir Fraser, George Dunlap
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: xm sched-credit2 - changing weight of dom0 freezes machine
2011-03-28 7:30 xm sched-credit2 - changing weight of dom0 freezes machine John Weekes
@ 2011-03-28 8:04 ` Pasi Kärkkäinen
0 siblings, 0 replies; 2+ messages in thread
From: Pasi Kärkkäinen @ 2011-03-28 8:04 UTC (permalink / raw)
To: John Weekes; +Cc: George Dunlap, xen-devel@lists.xensource.com, Keir Fraser
On Mon, Mar 28, 2011 at 12:30:08AM -0700, John Weekes wrote:
> 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
>
Ouch. Any output at all on the console?
> 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?
>
You should set up a serial console and enable various debugging/logging options..
Serial console: http://wiki.xensource.com/xenwiki/XenSerialConsole
Various debugging options for dom0 kernel: http://wiki.xen.org/xenwiki/XenParavirtOps
-- Pasi
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2011-03-28 7:30 xm sched-credit2 - changing weight of dom0 freezes machine John Weekes
2011-03-28 8:04 ` Pasi Kärkkäinen
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