Messages in this thread | | | Date | Sun, 18 Apr 2010 13:21:13 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [RFC patch] CFS fix place entity spread issue (v2) |
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On Sun, 18 Apr 2010, Mathieu Desnoyers wrote: > > CFS fix place entity spread issue (v2) > > Huge CFS vruntime spread (18 minutes) has been observed with LTTng while simply > running Xorg on a uniprocessor machine. Detailed explanation in my ELC2010 > presentation at:
Hmm. I tested this patch with my favourite non-scientific desktop load test: do web browsing while doing a kernel compile with "make -j16" (after doing a "git clean -dqfx" and "ccache -C" to get rid of old object files and ccache).
This is on a dual-core (with SMT, so 4 threads) Core i5, so "make -j16" overcommits the CPU's quite a bit.
And quite frankly, I think your patch makes things much worse. I don't have numbers, but it felt much choppier and slower to do scrolling in firefox o moving windows around while the load average is 20+.
My testload is in no way objective, nor necessarily any good, but it's the one I happen to use, and while it's subjective, I think the difference was pretty clear and not good.
Linus
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