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Subject[BENCHMARK] ext2 v ext3 with contest
Date
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Here's a contest run comparing 2.5.52-mm2 on the same osdl hardware with the
ext3 partitions mounted ext2 for comparison:

noload:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.52-mm2 [7] 39.2 181 0 0 1.08
2552mm2ext2 [5] 39.1 180 0 0 1.08
not significant

cacherun:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.52-mm2 [7] 36.5 194 0 0 1.01
2552mm2ext2 [5] 36.1 194 0 0 1.00
slight speedup here.

process_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.52-mm2 [7] 46.5 152 8 41 1.28
2552mm2ext2 [5] 48.3 144 10 48 1.33
slight shift in the balance; no significant change

ctar_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.52-mm2 [7] 52.8 154 1 10 1.46
2552mm2ext2 [5] 47.2 163 1 7 1.30
speedup with better overall cpu usage with ext2

xtar_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.52-mm2 [7] 76.1 124 1 8 2.10
2552mm2ext2 [5] 95.6 101 1 5 2.64
interesting - a shift in the opposite direction here with ext2 much slower
(large)

io_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.52-mm2 [7] 74.5 112 11 20 2.06
2552mm2ext2 [5] 77.4 118 11 13 2.14
same here

io_other:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.52-mm2 [7] 59.9 134 6 18 1.65
2552mm2ext2 [5] 52.8 137 6 11 1.46
slightly better with ext2

read_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.52-mm2 [7] 50.5 147 5 6 1.39
2552mm2ext2 [5] 49.3 149 5 6 1.36
slightly better ext2

list_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.52-mm2 [7] 43.7 167 0 9 1.21
2552mm2ext2 [5] 43.4 166 0 9 1.20

mem_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.52-mm2 [7] 66.0 141 39 3 1.82
2552mm2ext2 [5] 63.9 145 38 3 1.76
slightly better here

It seems the (possibly?) faster writing with ext2 causes slowdowns under heavy
writing loads on the same disk, but improvements with the other loads.

Interesting results (not quite what I was expecting)

Enjoy the festive season

Cheers,
Con
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