https://bugzilla.kernel.org/show_bug.cgi?id=65081 Bug ID: 65081 Summary: Starting a second guest with -smp 2 makes the first guest very slow and the second one hang (or also very slow) Product: Virtualization Version: unspecified Kernel Version: 3.12 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: kvm Assignee: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx Reporter: d.haid@xxxxxxx Regression: No I think this first occured when I upgraded the kernel to 3.11 and qemu to 1.6.1. I am now running kernel version 3.12 and the problem still exists. If I start a first KVM guest with -smp 2 it runs fine. As soon as I start another KVM guest on the same host also with -smp 2, the first one gets extremely slow. I can type one character per second via ssh. I do not see any messages from the second guest, so it seems to hang or is very slow. If I start the second kVM guest without -smp 2 both guests seem to work fine. I get the following messages on the host, but I do not know whether they are relevant. kvm: SMP vm created on host with unstable TSC; guest TSC will not be reliable qemu-system-x86: sending ioctl 5326 to a partition! qemu-system-x86: sending ioctl 80200204 to a partition! kvm [409]: vcpu0 unhandled rdmsr: 0xc0010001 kvm [409]: vcpu0 unhandled rdmsr: 0x3a - It is likely that this is not enough information to find the bug, so I would appreciate any help on what I can do to obtain more information about what might be happening here. -- You are receiving this mail because: You are watching the assignee of the bug. -- 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
