On Thu, Jan 9, 2014 at 9:39 AM, Markus Stockhausen <stockhau...@collogia.de> wrote: >> Von: squadra [squa...@gmail.com] >> Gesendet: Donnerstag, 9. Januar 2014 09:30 >> An: Markus Stockhausen >> Cc: Karli Sjöberg; users@ovirt.org >> Betreff: Re: [Users] Experience with low cost NFS-Storage as VM-Storage? >> >> try it, i bet that you will get better latency results with proper >> configured iscsitarget/initiator. > > I guess you did not take time to read the hole post. The latency I speak > of comes ontop the NFS latency. So my setup has > > - 83us latency per I/O in the hypervisor on a NFS share > - 450us latency per I/O in the VM on a disk hosted on the same NFS share > > If ISCSI could reduce latency to 40us instead of 83us in our wishfulst dreams > the QEMU penalty hits too hard.
There are some interesting tests here: http://www.linux-kvm.org/page/Virtio/Block/Latency Results seem to depend a lot on the guest OS IO stack/drivers (I see you use win2k3?). _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
