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Re: [Qemu-devel] qemu with kqemu freezes when more than one qemu is runn
From: |
Bakul Shah |
Subject: |
Re: [Qemu-devel] qemu with kqemu freezes when more than one qemu is running |
Date: |
Sun, 02 Jul 2006 18:11:50 -0700 |
"Frank J. Beckmann" <address@hidden> wrote:
>
> qemu-0.8.1_1 with kqemu-kmod-1.3.0.p9 on FreeBSD 6.1-RELEASE i386 freezes
> after less than one hour runtime when more than one qemu is running. If only
> one qemu is running everything works fine. When more than one qemu runs none
> of them can use kqemu without freezing after a short time. The frozen qemu
> can get killed only by a kill -9. The same happened with kqemu-kmod-1.3.0.p7.
>
>
> The processor is an AMD Athlon 64, but I use the i386 release of FreeBSD.
I ran two plan9 guests for over two hours now on my laptop
with no crash. They are both doing a ping every 10 ms and
continuous floating pt additions. kqemu is enabled but not
kernel-kqemu (as plan9performance under kernel-kqemu is
abysmal). This is a Pentium M machine with 1GB of memory,
running FreeBSD-current. plan9 is not very resource hungry
(RSS is about 70MB) so if this is a resource related problem
my test won't catch it.
A quick reading of kqemu-freebsd.c does not reveal any problems
for a uniprocessor machine (but I am not too sure of SMP).
Can people who are seeing crashes or hangs provide some more
information?
- symptom: (host crashes, guest crashes, guest hangs, guest loses its mind)
- freebsd version (also if UP or SMP version)
- processor
- command line used to invoke each qemu instance
- what guest oses are run when this happens
- if this is triggered more often by specific guest programs
- what happens if you run the same guests with less memory.
- output of sysctl kern.smp.cpus
- VSZ and RSS of these images (from ps axlw).
- whether -kernel-kqemu was used
I am hoping a pattern will emerge that will help us debug this.