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 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
