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SubjectRe: [BENCHMARK] I/O regression after 2.6.0-test5
From
> If you have time, would you please try testing as-iosched.c from
> test5 in a later kernel (it won't go into test8-mm1 though).

copying drivers/block/as-iosched.c from 2.6.0-test5 to test8
looks like it fixes the regression. Here are the results so far.

In the AIM7 database benchmark, jobs/minute using test5 as-iosched.c
doubled. At 32 tasks, jobs/min went from 300 to 601.
At 256 tasks, jobs/min went from 552 to 1010.

test5 as-iosched.c:
cat suite7-dbase-2.6.0-test8-as
Benchmark Version Machine Run Date
AIM Multiuser Benchmark - Suite VII "1.1" dev4-003

Tasks Jobs/Min Real CPU
32 601.0 316.3 134.0
64 782.6 485.8 259.2
96 869.1 656.1 387.6
128 919.3 827.0 522.8
160 955.0 995.2 650.3
192 981.9 1161.5 790.9
224 1002.3 1327.5 910.2
256 1009.9 1505.7 1027.7

Unmodififed test8.
cat suite7-dbase-2.6.0-test8
Benchmark Version Machine Run Date
AIM Multiuser Benchmark - Suite VII "1.1" dev4-003

Tasks Jobs/Min Real CPU
32 299.8 634.0 128.6
64 450.5 843.9 246.5
96 549.7 1037.4 366.0
128 558.7 1360.8 497.6
160 522.1 1820.2 612.2
192 515.5 2212.4 742.7
224 529.9 2510.8 859.5
256 552.4 2753.0 980.4

The AIM7 fileserver benchmark is back up to previous
levels when test8 uses the test5 as-iosched.c:


test5 as-iosched.c with test8.
cat suite7-fserver-2.6.0-test8-as
Benchmark Version Machine Run Date
AIM Multiuser Benchmark - Suite VII "1.1" dev4-003

Tasks Jobs/Min Real CPU
4 80.5 301.0 37.0
8 133.0 364.6 64.0
12 166.7 436.3 93.4
16 175.9 551.2 111.5
20 186.3 650.7 133.8
24 202.8 717.3 161.2
28 207.1 819.3 200.0
32 210.6 920.7 226.5


Unmodified test8.
cat suite7-fserver-2.6.0-test8
Benchmark Version Machine Run Date
AIM Multiuser Benchmark - Suite VII "1.1" dev4-003

Tasks Jobs/Min Real CPU
4 42.3 573.6 40.9
8 63.3 765.7 71.6
12 83.2 874.2 95.0
16 87.5 1108.4 102.5
20 105.0 1154.6 136.7
24 111.2 1308.1 162.2
28 130.7 1297.9 185.8
32 134.2 1444.5 212.9


My tiobench test hasn't completed yet, but test8 with test5's
as-iosched.c is making good progress. I think Nick nailed the
changeset.

--
Randy Hron
http://home.earthlink.net/~rwhron/kernel/bigbox.html

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