Re: guests locking up issue

[William Boughton <bill@boughton.de>]

> with KVM-70
> 
> my host: 
> dual quad core Intel E5320
> 4G ram
> Debian Etch
> 2.6.26-rc6 x86_64
> 
> my guest:
> debian etch 
> 2.6.26-rc6 x86_64
> 512 Mb ram

I rebuild my guest kernels without CONFIG_KVM_CLOCK, just with
CONFIG_HAVE_KVM=y

It now seems far more stable with -smp 4

> started with:
> 
> qemu-system-x86_64 -drive \
> file=/mnt/kvms/images/guitest.img,if=ide,boot=on -m 512  \
> -vnc localhost:2  -name guitest -monitor stdio -net \
> nic,model=e1000,macaddr=00:12:8E:BA:AC:22 -net \
> tap,script=/etc/qemu-ifup,ifname=tapguitest -k en-gb -smp 4
> 
> further details of my setup including .configs  are at 
> http://www.yuri.org.uk/~murble/kvm/
> 
> I'm also able to reproduce this with the same image on a
> dual Quad-Core AMD Opteron(tm) Processor 2354 with 16Gb of RAM.

I left two guest running all night building kernels in a loop
with -j3 and -smp 4 using both virtio-blk and net.  One running
on the Intel quad core machine the other on the AMD quadcore machine
running the same guest image file, kvm version and guest kernel
version.

Some time in the night the Intel guest froze the AMD hosted one
is still going strong.  The Intel host is hosting some other KVM
guests without virtio / smp which had bad been running several
days until I upgraded to 2.6.26-rc6 yesterday evening without any
crashes.

The guest running on Intel qemu monitor is still responsive but
the qemu-system-x86 was using 200% CPU constantly.

both guests were started with:

qemu-system-x86_64 -drive \
file=/mnt/kvms/images/guitest.img,if=virtio,boot=on -m 512 -vnc \
localhost:2 -name guitest -monitor stdio -net \
nic,model=virtio,macaddr=00:12:8E:BA:AC:22 -net \
tap,script=/etc/qemu-ifup,ifname=tapguitest -k en-gb -smp 4

Details of the amd host configuration are at
http://www.yuri.org.uk/~murble/kvm/amd/

When I quit from the qemu monitor on the intel host i got
a softlockup on the host 
http://www.yuri.org.uk/~murble/kvm/intel-host-softlockup.txt

my new guest .config

http://www.yuri.org.uk/~murble/kvm/new.guest.config.txt

used on both guests.


regards 

bill
-- 
Bill Boughton