From: "David S. Ahern" <daahern@cisco.com>
To: kvm-devel <kvm@vger.kernel.org>
Subject: RHEL5.5, 32-bit VM repeatedly locks up due to kvmclock
Date: Fri, 23 Apr 2010 11:08:22 -0600 [thread overview]
Message-ID: <4BD1D406.1040508@cisco.com> (raw)
After a few days of debugging I think kvmclock is the source of lockups
for a RHEL5.5-based VM. The VM works fine on one host, but repeatedly
locks up on another.
Server 1 - VM locks up repeatedly
-- DL580 G5
-- 4 quad-core X7350 processors at 2.93GHz
-- 48GB RAM
Server 2 - VM works just fine
-- DL380 G6
-- 2 quad-core E5540 processors at 2.53GHz
-- 24GB RAM
Both host servers are running Fedora Core 12, 2.6.32.11-99.fc12.x86_64
kernel. I have tried various versions of qemu-kvm -- the version in
FC-12 and the version for FC-12 in virt-preview. In both cases the
qemu-kvm command line is identical.
VM
- RHEL5.5, PAE kernel (also tried standard 32-bit)
- 2 vcpus
- 3GB RAM
- virtio network and disk
When the VM locks up both vcpu threads are spinning at 100%. Changing
the clocksource to jiffies appears to have addressed the problem.
David
next reply other threads:[~2010-04-23 17:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-23 17:08 David S. Ahern [this message]
2010-04-23 20:39 ` RHEL5.5, 32-bit VM repeatedly locks up due to kvmclock Brian Jackson
2010-04-23 21:39 ` Zachary Amsden
2010-04-23 21:42 ` David S. Ahern
2010-04-23 22:21 ` BRUNO CESAR RIBAS
2010-04-23 23:21 ` David S. Ahern
2010-04-24 18:40 ` Avi Kivity
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