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Here are contest (http://contest.kolivas.net) benchmark results with the osdl
hardware (http://www.osdl.org) for 2.5.59-mm6 (reconfigured hardware again to
get most useful results with contest). These results have been checked for
accuracy, repeatability and asterisks have been placed next to statistically
significant differences.
I do believe these show that sequential reads are indeed scheduled before
writes with this kernel. The question is, how long should they be scheduled
for?
no_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.59 3 79 94.9 0 0.0 1.00
2.5.59-mm6 1 78 96.2 0 0.0 1.00
cacherun:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.59 3 76 98.7 0 0.0 0.96
2.5.59-mm6 1 76 97.4 0 0.0 0.97
process_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.59 3 92 81.5 28 16.3 1.16
2.5.59-mm6 1 92 81.5 25 15.2 1.18
ctar_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.59 3 98 80.6 2 5.1 1.24*
2.5.59-mm6 3 112 70.5 2 4.5 1.44*
xtar_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.59 3 101 75.2 1 4.0 1.28*
2.5.59-mm6 3 115 66.1 1 4.3 1.47*
io_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.59 3 153 50.3 8 13.7 1.94*
2.5.59-mm6 3 106 70.8 4 9.4 1.36*
read_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.59 3 102 76.5 5 4.9 1.29*
2.5.59-mm6 3 733 10.8 56 6.3 9.40*
list_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.59 3 95 80.0 0 6.3 1.20*
2.5.59-mm6 3 97 79.4 0 6.2 1.24*
mem_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.59 3 97 80.4 56 2.1 1.23
2.5.59-mm6 3 94 83.0 50 2.1 1.21
dbench_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.59 3 126 60.3 3 22.2 1.59
2.5.59-mm6 3 122 61.5 3 25.4 1.56
io_other:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.59 3 89 84.3 2 5.5 1.13
2.5.59-mm6 2 90 83.3 2 6.7 1.15
io_load result is excellent showing the continuous write is delaying kernel
compilation by much less. read_load tells the rest of the story though.
read_load repeatedly reads a 256Mb file (the size of physical ram in the test
machine)
Con
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This archive was generated by hypermail 2b29 : Fri Jan 31 2003 - 22:00:25 EST