Re: [Qemu-devel] E5-2620v2 - emulation stop error

Dr. David Alan Gilbert
2015-03-10T19:37:34Z

* Paolo Bonzini (pbonzini@redhat.com) wrote:
>
>
> On 10/03/2015 19:21, Bandan Das wrote:
> > Paolo Bonzini <pbonzini@redhat.com> writes:
> >
> >> On 10/03/2015 17:57, Dr. David Alan Gilbert wrote:
> >>> I'm seeing something similar; it's very intermittent and generally
> >>> happening right at boot of the guest; I'm running this on qemu
> >>> head+my postcopy world (but it's happening right at boot before postcopy
> >>> gets a chance), and I'm using a 3.19ish kernel. Xeon E5-2407 in my case
> >>> but hey maybe I'm seeing a different bug.
> >
> > Probably a tangent but is the qemu trace identical to what Andrey is seeing ?
> > From a cursory look and my limited understanding, it seems his failure is #GP
> > when executing video bios.
> >
> >> Same here on 3.16 + Xeon E5 v3 kernel.
> >
> > I will try to reproduce this on a v2.
>
> I see several failures, usually mine have suberror 1. With a 32-VCPU
> guest I can reproduce it roughly half of the time.

Oh yes, that helps:

while true; do (sleep 5; echo -e '\001cq\n')|/opt/qemu-try-world3/bin/qemu-system-x86_64 -machine pc-i440fx-2.3,accel=kvm -m 8192 -smp 20 -nographic -device sga; done

gets it under a minute on my other box; Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz
(Running a 3.18)

Dave

> Paolo
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK