> > 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.
Or update the guest kernel (what guest kernel do you use?). AFAIK 3.X kernels does not trigger the bug. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
