[BENCHMARK] 100Hz preempt v nopreempt contest results

Con Kolivas (kernel@kolivas.org)
Tue, 3 Jun 2003 16:39:15 +1000


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Here are contest results on the same kernel 2.5.70-mm3 set to 100Hz with
(2.5.70-mm31) and without (2.5.70-mm3n) preempt.

no_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.70-mm31 1 77 94.8 0.0 0.0 1.00
2.5.70-mm3n 1 79 94.9 0.0 0.0 1.00
cacherun:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.70-mm31 1 74 98.6 0.0 0.0 0.96
2.5.70-mm3n 1 76 98.7 0.0 0.0 0.96
process_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.70-mm31 2 107 69.2 67.0 29.0 1.39
2.5.70-mm3n 2 137 53.3 133.5 45.3 1.73
ctar_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.70-mm31 3 105 73.3 0.7 3.8 1.36
2.5.70-mm3n 3 105 73.3 0.7 3.8 1.33
xtar_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.70-mm31 3 122 61.5 2.0 4.9 1.58
2.5.70-mm3n 3 113 65.5 2.0 4.4 1.43
io_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.70-mm31 4 114 65.8 41.0 19.3 1.48
2.5.70-mm3n 4 112 67.0 41.1 18.8 1.42
io_other:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.70-mm31 2 112 67.9 46.1 21.4 1.45
2.5.70-mm3n 2 112 67.0 46.0 20.4 1.42
read_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.70-mm31 2 100 76.0 7.5 7.0 1.30
2.5.70-mm3n 2 101 75.2 7.6 5.9 1.28
list_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.70-mm31 2 92 82.6 0.0 5.4 1.19
2.5.70-mm3n 2 94 79.8 0.0 6.4 1.19
mem_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.70-mm31 2 95 81.1 53.0 2.1 1.23
2.5.70-mm3n 2 94 80.9 52.0 2.1 1.19
dbench_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.70-mm31 4 297 24.9 4.5 52.5 3.86
2.5.70-mm3n 4 292 25.7 4.5 52.4 3.70

Note this time the ratio is less useful since they are both 100Hz. The
difference this time shows a large preempt improvement in process_load much
like 1000Hz did. Interestingly, even unloaded kernels no_load and cache_load
runs are faster with preempt. Only in xtar_load (repeatedly extracting a tar
with multiple small files) was no preempt faster.

Con
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