On Thu, Jan 6, 2011 at 6:00 PM, Michael S. Tsirkin <m...@redhat.com> wrote: > On Thu, Jan 06, 2011 at 04:41:50PM +0000, Stefan Hajnoczi wrote: >> Here are 4k sequential read results (cache=none) to check whether we >> see an ioeventfd performance regression with virtio-blk. >> >> The idea is to use a small blocksize with an I/O pattern (sequential >> reads) that is cheap and executes quickly. Therefore we're doing many >> iops and the cost virtqueue kick/notify is especially important. >> We're not trying to stress the disk, we're trying to make the >> difference in ioeventfd=on/off apparent. >> >> I did 2 runs for both ioeventfd=off and ioeventfd=on. The results are >> similar: 1% and 2% degradation in MB/s or iops. We'd have to do more >> runs to see if the degradation is statistically significant, but the >> percentage value is so low that I'm satisfied. >> >> Are you happy to merge virtio-ioeventfd v6 + your fixups? > > BTW if you could do some migration stress-testing too, > would be nice. autotest has support for it now.
Okay, I'll let you know the results. Stefan
