Re: [Users] Horrid performance during disk I/O
On Tue, Jan 14, 2014 at 10:38 PM, Blaster <Blaster(a)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-performan...
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.