Messages in this thread | | | Date | Fri, 10 Sep 2004 03:57:19 +1000 | From | Nick Piggin <> | Subject | Re: 2.6.9-rc1-mm4 |
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Martin J. Bligh wrote: >>>Well, the good news is that it compiles now, and without forcing ACPI on. >>> Yay! >> >>Does it boot? > > > Yup. Performance is the same as other -mm's (scheduler changes bring it > down from mainline quite a bit, but otherwise OK). > > Kernbench: (make -j N vmlinux, where N = 16 x num_cpus) > Elapsed System User CPU > 2.6.9-rc1 44.97 98.66 576.77 1501.33 > 2.6.9-rc1-mm1 46.92 107.27 594.10 1493.67 > 2.6.9-rc1-mm2 46.95 107.80 593.65 1493.33 > 2.6.9-rc1-mm4 46.93 108.91 593.19 1495.00 >
I'm looking into this performance thing a bit now (although I think Andrew is going to drop nicksched from the next mm).
It doesn't seem to be from lack of timeslice: with the default timeslice, nicksched gives average timeslices for a make -j vmlinux roughly the same size as those for the 2.6 scheduler (22ms).
Increasing base_timeslice can get it up to more than 25% (28ms) larger, but it still isn't as quick.
I suspect it may be unfairness in the 2.6 scheduler improving cache utilisation. Need to find a way to measure that though :P - 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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