On Tue, Jan 14, 2014 at 10:38 PM, Blaster <Blaster@556nato.com> wrote:
On 1/14/2014 11:04 AM, Andrew Cathrow wrote:
Did you compare virtio-block to virto-scsi, the former will likely outperform the latter.
No, but I have been meaning to, out of curiosity.
But why do you say virto-blk will be faster than virtio-scsi? The virtio-scsi wiki claims equal performance. That's also what I read but ... this presentation: http://www.linux-kvm.org/wiki/images/f/f9/2012-forum-virtio-blk-performance-... claims claims: "virtio-blk is about ~3 times faster than virtio-scsi in my setup" o_O So testing is definitely a good idea.
I've been trying to get some real numbers of the performance differences using iozone, but the numbers are all over the place, both on the HV and the guests, so not very meaningful. Not an iozone expert, so still trying to figure out what I'm doing wrong there as well.
I've also done some (relatively simple) testing with fio.