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SubjectHow can I boost block I/O performance
Hello all:

I've been trying some hacks to boost disk I/O performance mostly by
changing values
in the /proc/sys/vm filesystem. A vmstat display shows bursty block out
counts with
fairly consistent interrupt counts:

procs -----------memory---------- ---swap-- -----io---- --system--
----cpu----
r b swpd free buff cache si so bi bo in cs us sy
id wa
4 0 720 80252 1820 7077456 0 0 9 852 5 11 1
14 84 0
1 0 720 80444 1820 7077456 0 0 0 0 15923 77712 4
20 76 0
2 0 720 80196 1820 7077524 0 0 0 0 14705 87207 4
18 79 0
2 0 720 79732 1828 7077856 0 0 8 116 16235 84459 4
20 76 0
4 0 720 104172 1812 7051964 0 0 24 62568 20447 73499 4
27 69 0
2 0 720 105172 1812 7051964 0 0 0 90740 16960 80149 1
21 78 0
2 0 720 104108 1812 7051964 0 0 0 0 14162 72632 3
13 85 0
4 0 720 103980 1812 7052032 0 0 0 0 13495 68133 4
16 80 0
1 0 720 103868 1820 7052704 0 0 0 128 15417 59969 4
17 79 0
0 0 720 104340 1828 7052696 0 0 0 280 19504 74281 0
8 92 0
0 0 720 104532 1828 7052696 0 0 0 0 14736 70017 0
5 95 0
1 0 720 104596 1828 7052696 0 0 0 0 16006 73173 0
6 94 0
2 0 720 92844 1828 7064256 0 0 12 0 16508 80601 0
9 91 0
2 0 720 91916 1836 7064248 0 0 4 104 20787 74676 0
7 92 0
0 0 720 92580 1844 7064240 0 0 0 14640 17789 71545 0
10 90 0
1 0 720 92900 1844 7064240 0 0 0 0 15460 74760 0
8 92 0
0 0 720 92668 1844 7065260 0 0 0 0 18585 77435 0
7 93 0
0 0 720 92604 1844 7065260 0 0 0 0 19187 86426 0
9 91 0
2 0 720 91964 1860 7065244 0 0 0 140 23659 87962 0
8 92 0
5 0 720 90364 1860 7067080 0 0 40 66956 17995 95384 0
17 82 0

This test is running several NFS clients to a RAID disk storage array. I
also see the
same behavior when running SFTP transfers. What I'd like is a more even
block
out behavior (even at the expense of other apps as this is a file server
not an app
server). The values that I've been hacking are the
dirty_writeback_centisecs,
dirty_background_ratio, etc. Am I barking up the wrong tree?

Thanks in advance.

--
Dave Pitts PULLMAN: Travel and sleep in safety and comfort.
dpitts@cozx.com My other RV IS a Pullman (Colorado Pine).
http://www.cozx.com/~dpitts

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