* Alan D. Brunelle ([email protected]) 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
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