RE: Industry db benchmark result on recent 2.6 kernels

[Chen, Kenneth W]

Ingo Molnar wrote on Thursday, March 31, 2005 8:52 PM
> the current defaults for cache_hot_time are 10 msec for NUMA domains,
> and 2.5 msec for SMP domains. Clearly too low for CPUs with 9MB cache.
> Are you increasing cache_hot_time in your experiment? If that solves
> most of the problem that would be an easy thing to fix for 2.6.12.


Chen, Kenneth W wrote on Thursday, March 31, 2005 9:15 PM
> Yes, we are increasing the number in our experiments.  It's in the queue
> and I should have a result soon.

Hot of the press: bumping up cache_hot_time to 10ms on our db setup brings
2.6.11 performance on par with 2.6.9.  Theory confirmed.

- Ken


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