Poor performance (unresponsive, pausing, stuttering etc.)

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Re: Poor performance (unresponsive, pausing, stuttering etc.

Postby Fitzcarraldo » Mon Sep 13, 2010 4:32

DontPanic, how did you get on with the Mathieu Desnoyers patches? Any noticeable difference?

I finally got around to building the 2.6.35-r4-sabayon kernel this morning (without the Mathieu Desnoyers patches) to see how it performs, and of course to get rid of the infamous security hole.

//Off-topic:
BTW, does genkernel now work with --bootloader=grub2? I'm still using --bootloader=grub and then running 'grub-mkconfig -o /boot/grub/grub.cfg' afterwards manually.

I have a separate boot partition, which I mounted first. Despite merging sabayon-artwork-core-5.4, I found that the Grub splash image /boot/grub/default-splash.png was not updated to the 5.4 artwork. I have just re-merged sabayon-artwork-core-5.4 but /boot/grub/default-splash.png has still not changed. Presumably it should have? Any ideas? Anyway, I used the GIMP to scale the file kdgm.jpg from /usr/portage/distfiles/sabayon-artwork-core-5.4.tar.bz2 in order to create a default-splash.png with the 5.4 artwork, and I copied it to /boot/grub/, so I've fixed the Grub splash, but don't know why merging sabayon-artwork-core-5.4 didn't at least put into /boot/grub/ a new default-splash.png with the 5.4 artwork.
//
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Re: Poor performance (unresponsive, pausing, stuttering etc.

Postby joost » Mon Sep 13, 2010 9:31

//Offtopic
https://bugs.sabayon.org/show_bug.cgi?id=1578

I asked Ian in that bug.
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Re: Poor performance (unresponsive, pausing, stuttering etc.

Postby Fitzcarraldo » Mon Sep 13, 2010 9:34

//Offtopic:
Hehe, you're one step ahead of me - I had literally just finished searching the Bugzilla and read that bug... just before you added your latest comment!
//
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Re: Poor performance (unresponsive, pausing, stuttering etc.

Postby DontPanic » Mon Sep 13, 2010 14:43

Fitzcarraldo wrote:DontPanic, how did you get on with the Mathieu Desnoyers patches? Any noticeable difference?

I've had them installed on two machines for about two weeks now. I haven't really noticed any difference with them activated.

The "vmscan: raise the bar to PAGEOUT_IO_SYNC stalls" patch gave me a much more noticeable improvement.

I've been trying to benchmark the Mathieu Desnoyers/Nokia/Efficios patches with Con Kolivas' latency benchmark, interbench (I've added an ebuild to the overlay for this benchmark), and testing the same kernel with and without the patches enabled. This benchmark produces a lot of output that does not summarize very well. Also, some of the results are difficult to reproduce exactly due to the very nature of trying to measure latency when injecting randomness into the system.

But out of a battery of 32 latency tests, I'd say the patches had poorer latency performace (as measured by this benchmarking tool) about two-thirds of the time for those tests that showed a clear difference.

So, for my part, I've more or less lost interest in further work with this patch set. I don't notice any qualitative or quantitative difference, and the approach seemed to be meeting some resistance based on the feedback in the lkml thread discussing these patches.

Let me know if you have run across a better benchmark for measuring latency, and I'll try it.
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