Re: [Xen-users] old issue after 1024 live migrations seems to still exist.

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Jul 21, 2010 at 12:25:59PM -0400, Boris Quiroz wrote:
> 2010/7/21 Florian Heigl <florian.heigl@xxxxxxxxx>:
> > Hi,
> >
> > last month I did some checkig of old Xen issues that I remember and
> > found this one to still exist - if you do a high amount of live
> > migrations at some point the xen daemon chokes and dies.
> > The issue was reported by someone on the list like 4-5 years ago, but
> > it seems it hasn't been fixed (not sure if anyone even replied back
> > then)
> > The Xen version I used to test as 3.4.0 from Oracle VM 2.2
> >
> > Basically You just ping-pong one domU and somewhere after 900
> > migrations you first see it drop the ball a few times (vm needs to be
> > restarted) and then about 100 times later one one of the hosts the xen
> > daemon will crash, restart and not be able to boot vm's any more.
> >
> > (I waited a while to post this, but about time now I get it done)
> > I'm building some power management magic witrh loadbalancing so that
> > idle servers can automatically shutdown and startup, and cpu intensive
> > vm's can be distributed evenly.That this bug still exists is a
> > nightmare: 1024 migrations sounds a lot, but with 128 VMs on a host it
> > just equals just 4 migrations per VM, right? Without the loadbalancing
> > bit this wouldn't have to happen very often, but I think it's a key
> > feature.
> > If the RDMA live migration ever comes around, there'd be nothing against 
> > it...
> >
> > I've also prepared a clumsy script for the test, which can be found here:
> >
> > http://wartungsfenster.pastebin.org/410803
> >
> > I can open a bug report but i think it'd be best if someone re-test on
> > Xen4 first.
> >
> > Regards,
> > Florian
> >
> > p.s.:
> > why is live migration so slow (2-3 seconds)  - without sdp i had 2-3
> > gbit of bandwidth, the vm was 64MB size  (that means 1/6 second of
> > transfer for the main bulk) and idle without networking!
> > is it just the gratious arp?
> >
> > --
> > 'Sie brauchen sich um Ihre Zukunft keine Gedanken zu machen'
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >
> 
> Creepy..
> If this bug is still unsolved, could be XCP buggy too? Can anybody
> test it? At work I don't have any testing environment =(
> 

XCP doesn't have xend, it has xapid.

-- Pasi


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