Messages in this thread | | | Date | Fri, 23 Jan 2009 12:21:54 +0900 (JST) | From | KOSAKI Motohiro <> | Subject | Re: [ltt-dev] [RFC PATCH] block: Fix bio merge induced high I/O latency |
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> So, I ran the tests with my corrected patch, and the results are very > good ! > > "incoming ssh connexion" test > > "config 2.6.28 cfq" > Linux 2.6.28 > /sys/block/sd{a,b}/device/queue_depth = 31 (default) > /sys/block/sd{a,b}/queue/iosched/slice_async_rq = 2 (default) > /sys/block/sd{a,b}/queue/iosched/quantum = 4 (default) > > "config 2.6.28.1-patch1" > Linux 2.6.28.1 > Corrected cfq patch applied > echo 1 > /sys/block/sd{a,b}/device/queue_depth > echo 1 > /sys/block/sd{a,b}/queue/iosched/slice_async_rq > echo 1 > /sys/block/sd{a,b}/queue/iosched/quantum > > On /dev/sda : > > I/O scheduler runt-min (msec) runt-max (msec) > cfq (2.6.28 cfq) 523 6637 > cfq (2.6.28.1-patch1) 579 2082 > > On raid1 : > > I/O scheduler runt-min (msec) runt-max (msec) > cfq (2.6.28 cfq) 523 28216 > cfq (2.6.28.1-patch1) 517 3086
Congraturation. In university machine room (at least, the university in japan), parallel ssh workload freqently happend.
I like this patch :)
> > It looks like we are getting somewhere :) Are there any specific > queue_depth, slice_async_rq, quantum variations you would like to be > tested ? > > For reference, I attach my ssh-like job file (again) to this mail. > > Mathieu > > > [job1] > rw=write > size=10240m > direct=0 > blocksize=1024k > > [global] > rw=randread > size=2048k > filesize=30m > direct=0 > bsrange=4k-44k > > [file1] > startdelay=0 > > [file2] > startdelay=4 > > [file3] > startdelay=8 > > [file4] > startdelay=12 > > [file5] > startdelay=16 > > [file6] > startdelay=20 > > [file7] > startdelay=24 > > [file8] > startdelay=28 > > [file9] > startdelay=32 > > [file10] > startdelay=36 > > [file11] > startdelay=40 > > [file12] > startdelay=44 > > [file13] > startdelay=48 > > [file14] > startdelay=52 > > [file15] > startdelay=56 > > [file16] > startdelay=60 > > [file17] > startdelay=64 > > [file18] > startdelay=68 > > [file19] > startdelay=72 > > [file20] > startdelay=76 > > [file21] > startdelay=80 > > [file22] > startdelay=84 > > [file23] > startdelay=88 > > [file24] > startdelay=92 > > [file25] > startdelay=96 > > [file26] > startdelay=100 > > [file27] > startdelay=104 > > [file28] > startdelay=108 > > [file29] > startdelay=112 > > [file30] > startdelay=116 > > [file31] > startdelay=120 > > [file32] > startdelay=124 > > [file33] > startdelay=128 > > [file34] > startdelay=132 > > [file35] > startdelay=134 > > [file36] > startdelay=138 > > [file37] > startdelay=142 > > [file38] > startdelay=146 > > [file39] > startdelay=150 > > [file40] > startdelay=200 > > [file41] > startdelay=260 > > -- > Mathieu Desnoyers > OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 > > _______________________________________________ > ltt-dev mailing list > ltt-dev@lists.casi.polymtl.ca > http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
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