Re: FreeBSD guest hogs cpu after disk delay?

[Gleb Natapov <gleb@redhat.com>]

On Mon, Jan 04, 2010 at 08:06:15AM -0700, Thomas Fjellstrom wrote:
> On Sun January 3 2010, Thomas Fjellstrom wrote:
> > On Sun January 3 2010, Thomas Fjellstrom wrote:
> > > I have a strange issue, one of my free bsd guests started using up 100%
> > >  cpu and wouldnt respond in the console after a md-raid check started
> > > on the raid1 volume the vm has its lvm volumes on. About the only thing
> > > I could do was force the vm off, and restart it. In the guests console
> > > there was some kind of DMA warning/error related to the guest's disk
> > > saying it would retry, but it seems it never got that far.
> > 
> > I forgot to mention, the host is running debian sid with kernel 2.6.31-1-
> > amd64, and kvm --version reports:
> > 
> > QEMU PC emulator version 0.10.50 (qemu-kvm-devel-88)
> > 
> > the hosts / and the vm volumes all sit on a lvm volume group, ontop of a
> >  md- raid1 mirror of two Seagate 7200.12 500GB SATAII drives.
> > 
> > The host is running 7 other guest which all seem to be running smoothly,
> > except both freebsd (pfSense) based guests which seemed to have locked up
> > after this message:
> > 
> > ad0: TIMEOUT - WRITE_DMA retrying (1 retry left) LBA=16183439
> > 
> > Though the second freebsd guest didn't seem to use up nearly as much cpu,
> > but it uses up far lower resources than the first.
> > 
> 
> No one have an idea whats going wrong? All of my virtio based linux guests 
> stayed alive. But both of my FreeBSD guests using whatever "ide" in the -
> drive option sets locked up solid.
> 
Can you try more recent version of kvm?

--
			Gleb.