Messages in this thread | | | Date | Tue, 01 May 2007 08:03:23 -0400 | From | "Alan D. Brunelle" <> | Subject | Re: CFQ IO scheduler patch series - AIM7 DBase results on a 16-way IA64 |
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Jens Axboe wrote: > On Mon, Apr 30 2007, Alan D. Brunelle wrote: >> The results from a single run of an AIM7 DBase load on a 16-way ia64 box >> (64GB RAM + 144 FC disks) showed a slight regression (~0.5%) by adding >> in this patch. (Graph can be found at >> http://free.linux.hp.com/~adb/cfq/cfq_dbase.png ) It is only a single >> set of runs, on a single platform, but it is something to keep an eye on >> as the regression showed itself across the complete run. > > Do you know if this regression is due to worse IO performance, or > increased system CPU usage? We performed two point runs yesterday (20,000 and 50,000 tasks) and here are the results:
Kernel Tasks Jobs per Minute %sys (avg) ------ ----- --------------- ---------- 2.6.21 20000 60,831.1 39.83% CFQ br 20000 60,237.4 40.80% -0.98% +2.44%
2.6.21 50000 60,881.6 40.43% CFQ br 50000 60,400.6 40.80% -0.79% +0.92%
So we're seeing a slight IO performance regression with a slight increase in %system with the CFQ branch. (A chart of the complete run values is up on http://free.linux.hp.com/~adb/cfq/cfq_20k50k.png ).
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