Messages in this thread | | | From | Jeff Moyer <> | Subject | Re: [patch v4 0/3] aio: implement request batching [more performance numbers] | Date | Wed, 07 Oct 2009 08:09:10 -0400 |
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Jens Axboe <jens.axboe@oracle.com> writes:
> So here's a pretty basic test. It does random reads from a bunch of > devices, I tested both 4kb and 64kb block sizes. Queue depth used is 32 > for both cases, but note that this test uses a thread per device (so the > queue depth is 32 per device). Results are averaged over 3 runs. > slat/clat are the submission and completion latencies, they are in > microseconds here. > > 4kb random reads > > kernel sys IOPS slat clat > ---------------------------------------------------- > 2.6.32-rc3+patch 25.8% 192500 7.9 2606 > 2.6.32-rc3 27.4% 191300 8.4 2612 > > > > 64kb random reads > > kernel sys IOPS slat clat > ---------------------------------------------------- > 2.6.32-rc3+patch 2.5% 24590 9.7 9681 > 2.6.32-rc3 2.5% 24580 9.4 9691 > > So pretty close, nothing earth shattering here. What the results above > do not show is that the 4kb test runs very stable with your patch. > Mainline fluctuates somewhat in the bandwidth, most likely due to the > varying depth.
OK, good news. Thanks for testing!
Cheers, Jeff
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