Re: Talking about regressions...

[Michael Riepe <michael-0QoEqw4nQxo@public.gmane.org>]

Hi!

Uri Lublin wrote:
> 
> Thanks for running those tests.
> Does kvm complains ( dmesg ) ?

Not in the cases I listed. The host just becomes very busy, for a long
time. After ~30 minutes I lost patience and killed qemu.

I see a single "kvm: emulating exchange as write" when I try to boot
FreeBSD 6.1, and with Knoppix 5.1.1 the kernel reports "kvm: unhandled
wrmsr: 0xc1" once. Neither of these worked with earlier kvm versions,
though.

Interestingly, Knoppix 5.1.1 *does* work on an AMD Quad Dual-Core
Opteron we have at work (running Suse Linux Enterprise Server 10, as far
as I remember). Knoppix 5.0, on the other hand, which works fine on the
Core Duo, needs "acpi=off" as a boot parameter on the AMD.

More AMD results: FreeBSD, NetBSD and OpenSolaris (32-bit versions) all
fail with exceptions, usually page faults. OpenSolaris catches lots of
SIGILL's. OpenSuse 10.2 (32 bit as well) works, even with gfxmenu
enabled. Qemu-puppy behaves the same as on the Intel CPU - the old
version works, the new one sometimes hangs (and at the same point).

The next thing I'm going to try is the Dual Quad-Core Xeon... as soon as
I can get my hands on it. :-)

> -----Original Message-----
> From: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org on behalf of Michael Riepe
> Sent: Sun 14/01/2007 19:09
> To: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Subject: [kvm-devel] Talking about regressions...
> 
> When I did a couple of tests the other day, I noticed that one or more
> bugs must have been introduced at least into the vmx part in kvm-10:
> 
> - netbsd 3.1 used to work with kvm-9. In kvm-10, the system hangs during
> boot. One of the last things I can see is that a shell process dies with
> a SIGSEGV. Then the load rises to 100% (sys) on the host and stays there
> until I kill qemu (yes I've waited several minutes).
> 
> - opensolaris displays a "Time of Day clock error" during boot, claiming
> the clock has jumped by 0x5 (no unit given, I suppose that means
> seconds). Everything else seems to work.
> 
> - qemu-puppy-2.13-1 sometimes works and sometimes hangs somewhere inside
> the initial ramdisk. The exact place seems to differ, but usually it
> happens while the kernel modules are loaded. Again, host load rises to
> 100%. An older version (2.01-3) still works fine. kvm-9 works, too.
> 
> (Core Duo T2400, 32-bit SMP host, 32-bit guest, Linux 2.6.19 + kvm trunk
> revision 4290)
> 
> Any idea what to look for? The SIGSEGV on netbsd makes me suspect that
> there's a problem with the page tables, but I couldn't narrow down the
> cause yet.
> 
> --
> Michael "Tired" Riepe <michael-0QoEqw4nQxo@public.gmane.org>
> X-Tired: Each morning I get up I die a little
> 
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-- 
Michael "Tired" Riepe <michael-0QoEqw4nQxo@public.gmane.org>
X-Tired: Each morning I get up I die a little

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