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Tim Chen <tim.c.chen@linux.intel.com> writes: > On Fri, 2006-11-03 at 03:11 +0100, Adrian Bunk wrote: > >> >> What's your CONFIG_NR_CPUS setting that you are seeing such a big >> regression? >> > > CONFIG_NR_CPUS is set to 8. Ugh. This simply changes NR_IRQS from 256 to 512. Changing the size of data from 1K to 2K. So unless there is some other array that is sized by NR_IRQs in the context switch path which could account for this in other ways. It looks like you just got unlucky. The only hypothesis that I can seem to come up with is that maybe you are getting an extra tlb now that you didn't use to. I think the per cpu area is covered by huge pages but maybe not. Eric - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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