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Date: Tue, 27 Jul 2010 09:48:54 +0200
From: Heinz Diehl <htd@...cy-poultry.org>
To: Christoph Hellwig <hch@...radead.org>
Cc: Vivek Goyal <vgoyal@...hat.com>, linux-kernel@...r.kernel.org,
jaxboe@...ionio.com, nauman@...gle.com, dpshah@...gle.com,
guijianfeng@...fujitsu.com, jmoyer@...hat.com, czoccolo@...il.com
Subject: Re: [RFC PATCH] cfq-iosched: IOPS mode for group scheduling and new
group_idle tunable
On 26.07.2010, Christoph Hellwig wrote:
> Just curious, what numbers do you see when simply using the deadline
> I/O scheduler? That's what we recommend for use with XFS anyway.
Some fs_mark testing first:
Deadline, 1 thread:
# ./fs_mark -S 1 -D 10000 -N 100000 -d /home/htd/fsmark/test -s 65536 -t 1 -w 4096 -F
FSUse% Count Size Files/sec App Overhead
26 1000 65536 227.7 39998
26 2000 65536 229.2 39309
26 3000 65536 236.4 40232
26 4000 65536 231.1 39294
26 5000 65536 233.4 39728
26 6000 65536 234.2 39719
26 7000 65536 227.9 39463
26 8000 65536 239.0 39477
26 9000 65536 233.1 39563
26 10000 65536 233.1 39878
26 11000 65536 233.2 39560
Deadline, 4 threads:
# ./fs_mark -S 1 -D 10000 -N 100000 -d /home/htd/fsmark/test -s 65536 -t 4 -w 4096 -F
FSUse% Count Size Files/sec App Overhead
26 4000 65536 465.6 148470
26 8000 65536 398.6 152827
26 12000 65536 472.7 147235
26 16000 65536 477.0 149344
27 20000 65536 489.7 148055
27 24000 65536 444.3 152806
27 28000 65536 515.5 144821
27 32000 65536 501.0 146561
27 36000 65536 456.8 150124
27 40000 65536 427.8 148830
27 44000 65536 489.6 149843
27 48000 65536 467.8 147501
CFQ, 1 thread:
# ./fs_mark -S 1 -D 10000 -N 100000 -d /home/htd/fsmark/test -s 65536 -t 1 -w 4096 -F
FSUse% Count Size Files/sec App Overhead
27 1000 65536 439.3 30158
27 2000 65536 457.7 30274
27 3000 65536 432.0 30572
27 4000 65536 413.9 29641
27 5000 65536 410.4 30289
27 6000 65536 458.5 29861
27 7000 65536 441.1 30268
27 8000 65536 459.3 28900
27 9000 65536 420.1 30439
27 10000 65536 426.1 30628
27 11000 65536 479.7 30058
CFQ, 4 threads:
# ./fs_mark -S 1 -D 10000 -N 100000 -d /home/htd/fsmark/test -s 65536 -t 4 -w 4096 -F
FSUse% Count Size Files/sec App Overhead
27 4000 65536 540.7 149177
27 8000 65536 469.6 147957
27 12000 65536 507.6 149185
27 16000 65536 460.0 145953
28 20000 65536 534.3 151936
28 24000 65536 542.1 147083
28 28000 65536 516.0 149363
28 32000 65536 534.3 148655
28 36000 65536 511.1 146989
28 40000 65536 499.9 147884
28 44000 65536 514.3 147846
28 48000 65536 467.1 148099
28 52000 65536 454.7 149052
Here are the results of the fsync-tester, doing
"while : ; do time sh -c "dd if=/dev/zero of=bigfile bs=8M count=256 ;
sync; rm bigfile"; done"
in the background on the root fs and running fsync-tester on /home.
Deadline:
liesel:~/test # ./fsync-tester
fsync time: 7.7866
fsync time: 9.5638
fsync time: 5.8163
fsync time: 5.5412
fsync time: 5.2630
fsync time: 8.6688
fsync time: 3.9947
fsync time: 5.4753
fsync time: 14.7666
fsync time: 4.0060
fsync time: 3.9231
fsync time: 4.0635
fsync time: 1.6129
^C
CFQ:
liesel:/home/htd/fs # liesel:~/test # ./fsync-tester
fsync time: 0.2457
fsync time: 0.3045
fsync time: 0.1980
fsync time: 0.2011
fsync time: 0.1941
fsync time: 0.2580
fsync time: 0.2041
fsync time: 0.2671
fsync time: 0.0320
fsync time: 0.2372
^C
The same setup here, running both the "bigfile torture test" and
fsync-tester on /home:
Deadline:
htd@...sel:~/fs> ./fsync-tester
fsync time: 11.0455
fsync time: 18.3555
fsync time: 6.8022
fsync time: 14.2020
fsync time: 9.4786
fsync time: 10.3002
fsync time: 7.2607
fsync time: 8.2169
fsync time: 3.7805
fsync time: 7.0325
fsync time: 12.0827
^C
CFQ:
htd@...sel:~/fs> ./fsync-tester
fsync time: 13.1126
fsync time: 4.9432
fsync time: 4.7833
fsync time: 0.2117
fsync time: 0.0167
fsync time: 14.6472
fsync time: 10.7527
fsync time: 4.3230
fsync time: 0.0151
fsync time: 15.1668
fsync time: 10.7662
fsync time: 0.1670
fsync time: 0.0156
^C
All partitions are XFS formatted using
mkfs.xfs -f -l lazy-count=1,version=2 -i attr=2 -d agcount=4
and mounted that way:
(rw,noatime,logbsize=256k,logbufs=2,nobarrier)
Kernel is 2.6.35-rc6.
Thanks, Heinz.
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