specjbb2005 and aim7 regression with 2.6.32-rc kernels
From: Zhang, Yanmin
Date: Fri Nov 06 2009 - 02:38:14 EST
Comparing with 2.6.31, specjbb2005 and aim7 have some regressions with
2.6.32-rc kernels on core2 machines.
1) On 4*4 core tigerton: specjbb2005 has about 5% regression.
2) On 2*4 stoakley: aim7 has about 5% regression.
On Nehalem, specjbb2005 has about 2%~8% improvement instead of regression.
aim7 has much dependency on schedule patameters, such like sched_latency_ns,
sched_min_granularity_ns, and sched_wakeup_granularity_ns. 2.6.32-rc kernel
decreases these parameter values. I restore them and retest aim7 on stoakley.
aim7 regression becomes about 2% and specjbb2005 regression also becomes
2%. But on Nehalem, the improvement shrinks.
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