> I've noticed something really interesting. > > I get 5000 iops / VM for rand. 4k writes while assigning 4 cores on a > 2.5 Ghz Xeon. > > When i move this VM to another kvm host with 3.6Ghz i get 8000 iops (still 8 > cores) when i then LOWER the assigned cores from 8 to 4 i get > 14.500 iops. If i assign only 2 cores i get 16.000 iops... > > Why does less kvm cores mean more speed? There is a serious bug in the kvm vhost code. Do you use virtio-net with vhost? see: http://lists.nongnu.org/archive/html/qemu-devel/2012-11/msg00579.html Please test using the e1000 driver instead. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
