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SubjectRe: Benchmarking results: DSS elapsed time values w/ rq_affinity=0/1 - Jens' for-2.6.28 tree
Here are some results obtained during runs where we varied the number of
readers & the multi-block read counts. 5 runs per rq_affinity setting
were done, and the averages are plotted at:

http://free.linux.hp.com/~adb/jens/08-09-05/by_mbr.jpeg

In all cases we are seeing a noticeable improvement in reduction of
elapsed time to perform the tasks, and again we are seeing much tighter
deviations with rq_affinity set to 1:

Min Avg Max Std Dev
----- ----- ----- --------
mbrs= 32 nrdrs= 64 rq=0: 30.57 31.50 34.06 1.456108
mbrs= 32 nrdrs= 64 rq=1: 29.27 29.59 29.96 0.325469 6.05% improvement

mbrs= 32 nrdrs=128 rq=0: 28.14 28.48 29.32 0.480208
mbrs= 32 nrdrs=128 rq=1: 27.54 27.88 28.48 0.359194 2.11% improvement

mbrs= 32 nrdrs=256 rq=0: 33.05 33.70 34.30 0.548151
mbrs= 32 nrdrs=256 rq=1: 33.10 33.36 33.74 0.257158 1.01% improvement

mbrs= 64 nrdrs= 64 rq=0: 30.53 30.74 31.10 0.255441
mbrs= 64 nrdrs= 64 rq=1: 29.40 29.65 29.91 0.187216 3.55% improvement

mbrs= 64 nrdrs=128 rq=0: 28.09 28.79 29.23 0.484149
mbrs= 64 nrdrs=128 rq=1: 27.73 27.96 28.33 0.226429 2.89% improvement

mbrs= 64 nrdrs=256 rq=0: 33.35 34.04 34.76 0.518816
mbrs= 64 nrdrs=256 rq=1: 33.02 33.13 33.25 0.088034 2.67% improvement

mbrs=128 nrdrs= 64 rq=0: 30.37 30.75 31.23 0.329439
mbrs=128 nrdrs= 64 rq=1: 29.20 29.49 29.82 0.221179 4.08% improvement

mbrs=128 nrdrs=128 rq=0: 28.04 28.54 29.00 0.392785
mbrs=128 nrdrs=128 rq=1: 27.76 28.08 28.26 0.190840 1.63% improvement

mbrs=128 nrdrs=256 rq=0: 33.37 33.89 34.30 0.448297
mbrs=128 nrdrs=256 rq=1: 33.04 33.30 33.56 0.203175 1.76% improvement

mbrs=256 nrdrs= 64 rq=0: 30.55 30.80 30.94 0.167392
mbrs=256 nrdrs= 64 rq=1: 29.23 29.57 29.91 0.305156 3.99% improvement

mbrs=256 nrdrs=128 rq=0: 28.38 28.82 29.20 0.305172
mbrs=256 nrdrs=128 rq=1: 27.78 27.92 28.11 0.142583 3.12% improvement

mbrs=256 nrdrs=256 rq=0: 33.25 34.21 34.88 0.598398
mbrs=256 nrdrs=256 rq=1: 33.11 33.23 33.48 0.154499 2.88% improvement



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