Avi Kivity wrote:
Tomasz Chmielewski wrote:
Maybe virtio is racy and a loaded host exposes the race.
I see it happening with virtio on 2.6.29.x guests as well.
So, what would you do if you saw it on your systems as well? ;)
Add some debug routines into virtio_* modules?
I'm no virtio expert. Maybe I'd insert tracepoints to record interrupts
and kicks.
Accidentally, I made some "interesting" discovery.
This ~2 MB video shows a kvm-86 guest being rebooted and GRUB started:
http://syneticon.net/kvm/kvm-slowness.ogg
GRUB has its timeout set to 50 seconds, and is supposed to show it on
the screen by decreasing the number of seconds shown, every second.
Here, GRUB decreases the second counter very fast by 2 seconds, then
waits 2 seconds, then again decreases the number of sends by 2 seconds
very fast, and so on.
Perhaps my wording does not describe it very well though, so just try to
download the video and open it i.e. in mplayer.
Comments?
--
Tomasz Chmielewski
http://wpkg.org
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