Messages in this thread | | | Date | Wed, 23 May 2007 16:45:44 -0400 | From | Bill Davidsen <> | Subject | Re: Sched - graphic smoothness under load - cfs-v13 sd-0.48 |
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Miguel Figueiredo wrote: > Bill Davidsen wrote: >> I was unable to reproduce the numbers Miguel generated, comments >> below. The -ck2 patch seems to run nicely, although the memory >> repopulation from swap would be most useful on system which have a >> lot of memory pressure. >> >> I spent a few hours running the -ck2 patch, and I didn't see any >> numbers like yours. What I did see is going up with my previous >> results as http://www.tmr.com/~davidsen/sched_smooth_04.html. While >> there were still some minor pauses in glxgears with my test, >> performance was very similar to the sd-0.48 results. And I did try >> watching video with high load, without problems. Only when I run a >> lot of other screen-changing processes can I see pauses in the display. >>> Your subjective impressions would be helpful, and you may find that >>> the package in the www.tmr.com/~public/source is slightly easier to >>> use and gives more stable results. The documentation suggests the >>> way to take samples (the way I did it) but if you feel more or >>> longer samples would help it is tunable. >>> >>> I added Con to the cc list, he may have comments or suggestions >>> (against the current versions, please). Or he may feel that video >>> combined with other heavy screen updating is unrealistic or not his >>> chosen load. I'm told the load is similar to games which use threads >>> and do lots of independent action, if that's a reference. >>> >> I'll include the -ck2 patch in my testing on other hardware. >> > > Hi Bill, > > the numbers i posted before are repeatable on that machine. > The numbers you posted in <46534C31.1060306@debianpt.org> are not the same... From my inbox I grab some very non-matching values: ===== Here's the funny part...
Lets call:
a) to "random number of processes run while glxgears is running", gl_fairloops file
b) to "generated frames while running a burst of processes" aka "massive and uknown amount of operations in one process", gl_gears file
kernel 2.6.21-cfs-v13 2.6.21-ck2 a) 194464 254669 b) 54159 124 =====
The numbers in your glitch1.html file show a close correlation for cfs and -ck2, well within what I would expect. The stddev for the loops is larger for -cf2, but not out of line with what I see, and nothing like the numbers you originally sent me (which may have been testing something else, or from an old version before I made improvements, or ???). In any case thanks for testing.
> > I did run, again, glitch1 on my laptop (T2500 CoreDuo, also Nvidia) > please check: http://www.debianpt.org/~elmig/pool/kernel/20070523/ > > Thanks, those data seem as expected.
-- bill davidsen <davidsen@tmr.com> CTO TMR Associates, Inc Doing interesting things with small computers since 1979
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