John Weekes
2011-Mar-28 07:30 UTC
[Xen-devel] xm sched-credit2 - changing weight of dom0 freezes machine
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 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Pasi Kärkkäinen
2011-Mar-28 08:04 UTC
Re: [Xen-devel] xm sched-credit2 - changing weight of dom0 freezes machine
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 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel