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Date: Wed, 26 Mar 2008 14:24:09 -0400 From: "Alan D. Brunelle" <Alan.Brunelle@...com> To: linux-kernel@...r.kernel.org Cc: Jens Axboe <jens.axboe@...cle.com>, npiggin@...e.de, dgc@....com Subject: IO CPU Affinity: more results... Current blk.git origin/io-cpu-affinity sources: After 60 successful passes on a 4-way ia64: 60 0 mkfs untar make 60 1 mkfs untar make Part RQ Min Avg Max Dev ----- -- ------- ------- ------- ------- mkfs 0 81.233 81.810 82.599 0.330 mkfs 1 81.083 81.854 82.973 0.405 untar 0 17.075 17.676 18.098 0.273 untar 1 16.975 17.570 18.128 0.288 make 0 24.231 24.380 24.541 0.085 make 1 24.116 24.312 24.459 0.073 ----- -- ------- ------- ------- ------- comb 0 122.898 123.866 125.002 0.516 comb 1 122.620 123.736 125.156 0.521 ===== == ======= ======= ======= ======= psys 0 2.12% 2.19% 2.28% 0.035 psys 1 1.92% 2.00% 2.25% 0.049 so: 1. It's working pretty solidly on ia64 2. We still see reduced combined times w/ rq=1 (albeit, not much - and certainly nothing definitive with the relatively high standard deviations). 3. We see large reduction in %system to do the same work - 8% less And here's something else I've noticed: It seems that as the runs go on, the makes happen quicker (in general). I've got some graphs on free.linux.hp.com - they are a bit busy, but here are some pointers: 1. Black stuff is for rq=0, red stuff is for rq=1 2. Solid horizontal line indicates the set average. 3. Lower numbers for /all/ graphs are better 4. Open circles represent individual test run points 5. Hashed-line w/ shaded large circles represents localized averages: each circle is the average of the surrounding 5 data points. The last thing is key: you'll see on http://free.linux.hp.com/~adb/jens/make.png The black hashed line (rq=0) tends to bop around the average, whilst the red hashed line (rq=1) seems to show a downwards trend. (I need to run this a lot longer to see if it holds up.) Note: this trending-downwards does /not/ appear in the mkfs & untar parts of the operations. /Every/ time I've had extended runs with rq=1 I see this trend. Note: %sys doesn't really fluctuate much at all - as can be seen by: http://free.linux.hp.com/~adb/jens/psys.png The other graphs include: http://free.linux.hp.com/~adb/jens/mkfs.png http://free.linux.hp.com/~adb/jens/untar.png http://free.linux.hp.com/~adb/jens/comb.png Alan D. Brunelle HP / OSLO / S&P -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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