I have a small pc which boots from a compactflash card. I tested to
see if there were any significant differences between io scedulers
in this case. Disk seeks are supposed to be a no-op in this case.
I post the results here in case someone is interested.
bonnie -s 1024
==============
cfq:
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
mini 1G 9439 98 8251 7 5369 4 8207 82 21348 12 1367 9
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 6771 30 +++++ +++ 198 0 2312 10 +++++ +++ 80 0
deadline:
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
mini 1G 9049 93 8872 7 4989 4 9758 98 21459 12 468.2 2
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 6968 32 +++++ +++ 148 0 5888 26 +++++ +++ 67 0
noop:
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
mini 1G 9294 97 10829 9 4655 3 9042 90 21529 12 261.0 1
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 7426 34 +++++ +++ 139 0 2215 9 +++++ +++ 65 0
compact format:
cfq1: mini,1G,9439,98,8251,7,5369,4,8207,82,21348,12,1367.4,9,16,6771,30,+++++,+++,198,0,2312,10,+++++,+++,80,0
cfq2: mini,1G,9410,97,8370,7,5347,4,8177,82,21295,12,1319.4,9,16,6041,27,+++++,+++,175,0,2846,12,+++++,+++,74,0
deadline:mini,1G,9049,93,8872,7,4989,4,9758,98,21459,12,468.2,2,16,6968,32,+++++,+++,148,0,5888,26,+++++,+++,67,0
noop: mini,1G,9294,97,10829,9,4655,3,9042,90,21529,12,261.0,1,16,7426,34,+++++,+++,139,0,2215,9,+++++,+++,65,0
bonnie++ -s 1024
================
cfq:
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
mini 1G 9437 98 8100 7 5296 4 8129 81 21330 12 1376 9
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 6306 29 +++++ +++ 173 0 2614 11 +++++ +++ 73 0
deadline:
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
mini 1G 9063 94 11267 9 5548 4 9536 95 21530 12 782.9 4
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 10126 46 +++++ +++ 156 0 2115 9 +++++ +++ 71 0
noop:
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
mini 1G 9288 97 10493 9 4615 3 9582 96 21524 12 258.1 1
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 7179 32 +++++ +++ 138 0 3706 16 +++++ +++ 67 0
compact:
cfq: mini,1G,9437,98,8100,7,5296,4,8129,81,21330,12,1375.8,9,16,6306,29,+++++,+++,173,0,2614,11,+++++,+++,73,0
deadline:mini,1G,9063,94,11267,9,5548,4,9536,95,21530,12,782.9,4,16,10126,46,+++++,+++,156,0,2115,9,+++++,+++,71,0
noop: mini,1G,9288,97,10493,9,4615,3,9582,96,21524,12,258.1,1,16,7179,32,+++++,+++,138,0,3706,16,+++++,+++,67,0
The machine has a via C3 nehemiah processor, and uses a 4GB 100x kingston
compactflash card. This card does 21MB/s when reading according to
hdparm (and 20MB/s according to the spec.) The card uses a
ide-compactflash converter, which supports udma2.
A nice little machine that I mostly use for car navigation
and mp3/ogg/cd-player. The kernel is loaded 12s after power-on,
X shows itself after 35s, and my navigation software after 45s. :-)
Helge Hafting
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