On 2011-04-18 20:32, Bart Van Assche wrote: > On Mon, Apr 18, 2011 at 8:28 PM, Jens Axboe <[email protected]> wrote: >> On 2011-04-18 20:21, Bart Van Assche wrote: >>> a performance regression in the block layer not related to the md >>> issue. If I run a small block IOPS test on a block device created by >>> ib_srp (NOOP scheduler) I see about 11% less IOPS than with 2.6.38.3 >>> (155.000 IOPS with 2.6.38.3 and 140.000 IOPS with 2.6.39-rc3+). >> >> That's not good. What's the test case? > > Nothing more than a fio IOPS test: > > fio --bs=512 --ioengine=libaio --buffered=0 --rw=read --thread > --iodepth=64 --numjobs=2 --loops=10000 --group_reporting --size=1G > --gtod_reduce=1 --name=iops-test --filename=/dev/${dev} --invalidate=1
Interesting, I'll have to check if we regressed with all these recent changes. Comparing your .38 to .39-rc3+, are you using more/less CPU, more/less sys%, etc? A quick perf record -fg / perf report -g for both kernels would be nice to see. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe kernel-testers" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
