P.S.
On Mon, 2009-09-28 at 06:04 +0200, Mike Galbraith wrote:
> - = virgin tip v2.6.31-10215-ga3c9602
> + = with patchlet
> Avg
> dd pre 67.4 70.9 65.4 68.9 66.2 67.7-
> 65.9 68.5 69.8 65.2 65.8 67.0- Avg
> 70.4 70.3 65.1 66.4 70.1 68.4- 67.7-
> 73.1 64.6 65.3 65.3 64.9 66.6+ 65.6+
> .968
> 63.8 67.9 65.2 65.1 64.4 65.2+
> 64.9 66.3 64.1 65.2 64.8 65.0+
> perf stat 8.66 16.29 9.65 14.88 9.45 11.7-
> 15.36 9.71 15.47 10.44 12.93 12.7-
> 10.55 15.11 10.22 15.35 10.32 12.3- 12.2-
> 9.87 7.53 10.62 7.51 9.95 9.0+ 9.1+
> .745
> 7.73 10.12 8.19 11.87 8.07 9.1+
> 11.04 7.62 10.14 8.13 10.23 9.4+
> dd post 63.4 60.5 66.7 64.5 67.3 64.4-
> 64.4 66.8 64.3 61.5 62.0 63.8-
> 63.8 64.9 66.2 65.6 66.9 65.4- 64.5-
> 60.9 63.4 60.2 63.4 65.5 62.6+ 61.8+
> .958
> 63.3 59.9 61.9 62.7 61.2 61.8+
> 60.1 63.7 59.5 61.5 60.6 61.0+
Deadline and noop fsc^W are less than wonderful choices for this load.
perf stat 12.82 7.19 8.49 5.76 9.32 anticipatory
16.24 175.82 154.38 228.97 147.16 noop
43.23 57.39 96.13 148.25 180.09 deadline
28.65 167.40 195.95 183.69 178.61 deadline v2.6.27.35
-Mike
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