RE: raid5 slow (looks like 2.6 problem)

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just rebooted my system with an old 2.4.20 kernel (got from backup)

(2.4.20 13d r5 ext3)

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
storage.a2000.nu 2G 21931 99 96429 99 79370 73 28970 99 280316 84 675.7 3
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 1444 71 +++++ +++ +++++ +++ 2024 99 +++++ +++ 5563 98
storage.a2000.nu,2G,21931,99,96429,99,79370,73,28970,99,280316,84,675.7,3,16,1444,71,+++++,+++,+++++,+++,2024,99,+++++,+++,5563,98



again rebooted to 2.6.9-ac11 : (previous score was from xfs, so retested with ext3) (2.6.9-ac11 13d r5 ext3)

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
storage.a2000.nu 2G 21711 99 99906 95 67559 79 24099 92 138763 72 606.4 3
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 1470 79 +++++ +++ +++++ +++ 1447 78 +++++ +++ 4546 96
storage.a2000.nu,2G,21711,99,99906,95,67559,79,24099,92,138763,72,606.4,3,16,1470,79,+++++,+++,+++++,+++,1447,78,+++++,+++,4546,96


looks like something is wrong with the 2.6 code ?
i'm now compiling normal 2.6.9 (and maybe 2.6.8 after this?) to check for results


any ideas ?
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