[REPORT] 2.6.21 vs. 2.6.21-sd046 vs. 2.6.21-CFSv7

From: Bill Davidsen
Date: Mon Apr 30 2007 - 15:31:00 EST

System: Intel 6600 Core2duo, 2GB RAM, X nice 0 for all tests, display using i945G framebuffer

Test: playing a 'toon with mplayer while kernel build -j20 running.

Tuning: not yet, all scheduler parameters were default

Result: base 2.6.21 showed some pauses and after the pause the sound got louder for a short time (<500ms). With sd-0.46 the playback had many glitches and finally just stopped with the display looping on a small number of frames and no sound. The skips were repeatable, the hang was only two of five runs, I didn't let them go until the make finished (todo list) but killed the mplayer after 10-15 sec. No glitches observed with cfsv7, I thought I saw one but repeating with granularity set to 500000 and then with no make running convinced me that it's just a crappy piece of animation at that point.

I ran glxgears, again sd-0.46 had frequent pauses and uneven fps reported. Stock 2.6.21 had a visible pause when the frame rate was output, otherwise minimal pauses. CFSv7 appeared smooth at about 250 fps.

All tests gave acceptable typing echo, it seems that X is getting enough time at that load to echo without major issues.

I will be doing tests with server load later this week, have to add disk for the database.

Hope this initial report is useful, I may be able to update ctxbench later today and try that.

Bill Davidsen <davidsen@xxxxxxx>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot

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