<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div><br></div><div>I finally found time to switch from virtio-scsi to virtio. Seems to have make a big difference.</div><div><br></div><div>The windows VMs boot faster, web pages load faster, same with the Fedora 20 VMs. </div><div>Everything just feels smoother.</div><div><br></div><div>I found this interesting presentation:</div><div><a href="http://events.linuxfoundation.org/sites/events/files/slides/CloudOpen2013_Khoa_Huynh_v3.pdf">http://events.linuxfoundation.org/sites/events/files/slides/CloudOpen2013_Khoa_Huynh_v3.pdf</a></div><div><br></div><div>Claims virtio blk and scsi are the same speed. Although, it doesn’t mention if this was with or without data plane enabled.</div><div><br></div><div>When will data plane be the default?</div><div><br></div><br><div><div>On Jan 15, 2014, at 3:11 AM, Sander Grendelman <<a href="mailto:sander@grendelman.com">sander@grendelman.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">On Tue, Jan 14, 2014 at 10:38 PM, Blaster <<a href="mailto:Blaster@556nato.com">Blaster@556nato.com</a>> wrote:<br><blockquote type="cite">On 1/14/2014 11:04 AM, Andrew Cathrow wrote:<br><blockquote type="cite"><br>Did you compare virtio-block to virto-scsi, the former will likely<br>outperform the latter.<br></blockquote><br><br>No, but I have been meaning to, out of curiosity.<br><br>But why do you say virto-blk will be faster than virtio-scsi? The<br>virtio-scsi wiki claims equal performance.<br></blockquote>That's also what I read but ... this presentation:<br><a href="http://www.linux-kvm.org/wiki/images/f/f9/2012-forum-virtio-blk-performance-improvement.pdf">http://www.linux-kvm.org/wiki/images/f/f9/2012-forum-virtio-blk-performance-improvement.pdf</a><br>claims<br>claims: "virtio-blk is about ~3 times faster than virtio-scsi in my setup" o_O<br>So testing is definitely a good idea.<br><blockquote type="cite"><br>I've been trying to get some real numbers of the performance differences<br>using iozone, but the numbers are all over the place, both on the HV and the<br>guests, so not very meaningful. Not an iozone expert, so still trying to<br>figure out what I'm doing wrong there as well.<br></blockquote><br>I've also done some (relatively simple) testing with fio.<br></blockquote></div><br></body></html>