lkml.org 
[lkml]   [2003]   [Jun]   [30]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateMon, 30 Jun 2003 10:02:58 +0400
FromSamium Gromoff <>
Subject[VM] writes starve reads in 2.5.72-bk1
load:                           gzipping a 128M file, with "gzip file"
CPU:                            p3-500
physical RAM installed:         256M
kernel:                         2.5.72-bk1
drive:                          one 10krpm IBM
controller:                     DAC960PL RAID controller

0  1   9384   3960  33640 116184    0    0  1280  4096 1022   122 63  7  0 30
1  0   9384   4016  33220 116568    0    0  1792     0 1096   122 81  7  0 12
1  0   9384   3624  33156 117112    0    0  2048     0 1036   119 92  8  0  0
1  1   9384   4856  32024 116876    0    0  1024 11432 1092   145 48  5  2 44
0  2   9384   4632  32024 117164    0    0   128  7288 1120   208  8  2  0 90
0  2   9384   4072  32024 117676    0    0   256  9172 1149   224 12  2  0 86
1  0   9384   3624  31516 118684    0    0   896   944 1146   145 38  4  0 58
1  0   9384   3288  30916 119764    0    0  2048     0 1031   117 92  8  0  0
1  0   9384   4128  30620 119228    0    0  1920    92 1062   160 92  7  1  0
1  0   9384   3960  30208 120120    0    0  2048     0 1033   115 93  7  0  0
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
problem as i see it:

although the drive is mostly idle since the cpu is too slow to max it out,
reads are starved during bursts of gzipped data writeouts,
causing gzip to spend its time on sleeping on request completion.

regards, Samium Gromoff
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:46    [from the cache]
©2003-2008