Messages in this thread | | | Subject | specjbb2005 and aim7 regression with 2.6.32-rc kernels | From | "Zhang, Yanmin" <> | Date | Fri, 06 Nov 2009 15:38:50 +0800 |
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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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