Did values change in /proc/sys/vm/{min,max}-readahead?http://lists.us.dell.com/pipermail/linux-poweredge/2004-February/036166.html
Guy wrote:
Now the bad news...
I have 2 CPUs P3-500Mhz, 512Meg ram. So I ran 2 bonnies at the same time.
Kernel 2.4.20-8 with 2 Bonnies at the same time: Version 1.03 ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP watkins-ho 1G 3091 85 18593 44 9733 24 3443 97 59895 60 249.6 6 watkins-ho 1G 2980 87 21176 54 10167 23 3478 99 44525 44 384.2 9 ---- ----- ----- ---- ------ ----- Total 6071 39769 19900 6921 104420 633.8
Kernel 2.4.28 with 2 Bonnies at the same time: watkins-ho 1G 4456 92 17922 52 6489 17 4961 96 26571 32 320.4 12 watkins-ho 1G 4343 89 17987 52 6197 17 4946 96 25646 31 363.7 7 ---- ----- ----- ---- ------ ----- Total 8799 35909 12686 9907 52217 684.1
Very odd, the sequential read speed is almost exactly 1/2 now.
Oh well, I still can't tell without a tool to measure the speed. But I still don't like it!
My network is only 100BaseT, so it is still well beyond that!
Guy
-----Original Message----- From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Guy Sent: Wednesday, January 12, 2005 1:17 AM To: linux-raid@xxxxxxxxxxxxxxx Subject: raid5 performance after upgrade to 2.4.28
About 1 month ago I upgraded from Kernel 2.4.20-8 to 2.4.28. Today I noticed my sequential read speed is up by about 12%.
I don't recall making any other changes that would affect speed. So, I guess the Kernel upgrade made the difference.
An old bonnie output: Version 1.03 ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP watkins-ho 1G 3293 97 34587 89 22306 53 3549 99 67492 63 500.1 9
Today: watkins-ho 1G 4944 99 31719 65 18538 43 5184 98 75440 71 602.5 8 ^^^^ ^^^^ ^^^^^ ^^^^^
Some things improved, others decreased.
Of course, no change I can notice on my own. I needed to measure performance to notice.
I guess I should try Kernel 2.6 some day.
Guy
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