On 16.08.2012 14:47, Richard Davies wrote: > http://marc.info/?l=qemu-devel&m=134304194329745 > > > We have been experiencing this problem for a while now too, using qemu-kvm > (currently at 1.1.1). > > Unfortunately, hv_relaxed doesn't seem to fix it. The following command line > produces the issue: > > qemu-kvm -nodefaults -m 4096 -smp 8 -cpu host,hv_relaxed -vga cirrus > -usbdevice tablet -vnc :99 -monitor stdio -hda test.img
Just one question: did you try explicitly using hugepages? For that, - reserve some amount of hugepages (echo something > /proc/sys/vm/nr_hugepages), - mount hugetlbfs to somewhere, like, /dev/hugetlbfs - use -mem-path=/dev/hugetlbfs qemu option This may also reduce your lock contention. Sure, hugepages have some minus sides too, but I think it is worth to try anyway - for a single VM or for whole lot of VMs (for that you'll have to reserve much more memory after host boot). /mjt
