* Alan D. Brunelle (Alan.Brunelle@xxxxxx) wrote: > Taking Linux 2.6.23-rc6 + 2.6.23-rc6-mm1 as a basis, I took some sample > runs of the following on both it and after applying Mathieu Desnoyers > 11-patch sequence (19 September 2007). > > * 32-way IA64 + 132GiB + 10 FC adapters + 10 HP MSA 1000s (one 72GiB > volume per MSA used) > > * 10 runs with each configuration, averages shown below > o 2.6.23-rc6 + 2.6.23-rc6-mm1 without blktrace running > o 2.6.23-rc6 + 2.6.23-rc6-mm1 with blktrace running > o 2.6.23-rc6 + 2.6.23-rc6-mm1 + markers without blktrace running > o 2.6.23-rc6 + 2.6.23-rc6-mm1 + markers with blktrace running > > * A run consists of doing the following in parallel: > o Make an ext3 FS on each of the 10 volumes > o Mount & unmount each volume > + The unmounting generates a tremendous amount of writes > to the disks - thus stressing the intended storage > devices (10 volumes) plus the separate volume for all > the blktrace data (when blk tracing is enabled). > + Note the times reported below only cover the > make/mount/unmount time - the actual blktrace runs > extended beyond the times measured (took quite a while > for the blk trace data to be output). We're only > concerned with the impact on the "application" > performance in this instance. > > Results are: > > Kernel w/out BT STDDEV w/ BT STDDEV > ------------------------------------- --------- ------ --------- ------ > 2.6.23-rc6 + 2.6.23-rc6-mm1 14.679982 0.34 27.754796 2.09 > 2.6.23-rc6 + 2.6.23-rc6-mm1 + markers 14.993041 0.59 26.694993 3.23 > Interesting results, although we cannot say any of the solutions has much impact due to the std dev. Also, it could be interesting to add the "blktrace compiled out" as a base line. Thanks for running those tests, Mathieu > It looks to be about 2.1% increase in time to do the make/mount/unmount > operations with the marker patches in place and no blktrace operations. > With the blktrace operations in place we see about a 3.8% decrease in > time to do the same ops. > > When our Oracle benchmarking machine frees up, and when the > marker/blktrace patches are more stable, we'll try to get some "real" > Oracle benchmark runs done to gage the impact of the markers changes to > performance... > > Alan D. Brunelle > Hewlett-Packard / Open Source and Linux Organization / Scalability and > Performance Group > -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 - To unsubscribe from this list: send the line "unsubscribe linux-btrace" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
