Brian Jackson wrote: > Richard Davies wrote: > > The host in question has 128GB RAM and dual AMD Opteron 6128 (16 cores > > total). It is running kernel 3.5.1 and qemu-kvm 1.1.1. > > > > In this morning's test, we have 3 guests, all booting Windows with 40GB RAM > > and 8 cores each (we have seen small VMs go slow as I originally said, but > > it is easier to trigger with big VMs): > > > > pid 15665: qemu-kvm -nodefaults -m 40960 -smp 8 -cpu host,hv_relaxed \ > > -vga cirrus -usbdevice tablet -vnc :99 -monitor stdio -hda test1.raw > > pid 15676: qemu-kvm -nodefaults -m 40960 -smp 8 -cpu host,hv_relaxed \ > > -vga cirrus -usbdevice tablet -vnc :98 -monitor stdio -hda test2.raw > > pid 15653: qemu-kvm -nodefaults -m 40960 -smp 8 -cpu host,hv_relaxed \ > > -vga cirrus -usbdevice tablet -vnc :97 -monitor stdio -hda test3.raw > > What memory options have you tried? (KSM, hugepages, -mem-preallocate)? The host kernel has KSM and CONFIG_TRANSPARENT_HUGEPAGE=y and CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y. Our qemu-kvm command lines are as above, so we aren't using -mem-prealloc. We'll try that. > Is this only with 2008? (is that regular? R2?) It is intermittent. We definitely see it with 2008 R2, and I believe with 2008 as well. We don't have many customers running earlier versions of Windows. > Have you tried any of the hyperv features/hints? We have tried "-cpu host" and "-cpu host,hv_relaxed" as above, which both exhibit the bug. What other hyperv options do you think we should try? Richard. -- 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
