Date: Wed, 23 Jan 2008 22:10:31 -0700 From: Joe Peterson <joe@skyrush.com> To: freebsd-stable@freebsd.org Subject: New KTR trace for mouse freezing/stuttering in 7.0-RC1 Message-ID: <47981DC7.2030706@skyrush.com> In-Reply-To: <4797F0D7.8020702@skyrush.com> References: <1199812249.96494.133.camel@predator-ii.buffyverse> <1200156892.1196.34.camel@predator-ii.buffyverse> <1200197025.1225.17.camel@predator-ii.buffyverse> <4789F872.8000502@FreeBSD.org> <1200241867.1677.34.camel@predator-ii.buffyverse> <478A7014.4080804@FreeBSD.org> <1200323959.1971.27.camel@predator-ii.buffyverse> <478BC0AA.3080906@FreeBSD.org> <1200589144.7141.27.camel@predator-ii.buffyverse> <478FB18B.3090204@FreeBSD.org> <1200677810.57226.45.camel@predator-ii.buffyverse> <1200752559.48952.31.camel@predator-ii.buffyverse> <1200764776.48952.64.camel@predator-ii.buffyverse> <1200847317.64691.33.camel@predator-ii.buffyverse> <1201095768.349.21.camel@predator-ii.buffyverse> <47975CFE.4070000@skyrush.com> <20080123135705.3ff903e4@linwhf.opal.com> <479794E3.5060307@skyrush.com> <20080123161128.01040b96@linwhf.opal.com> <4797B041.2020700@skyrush.com> <20080123174820.08ba33ad@linwhf.opal.com> <4797DE22.6020508@skyrush.com> <4797F0D7.8020702@skyrush.com>
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In an attempt to track down this mouse freezing/stuttering (i.e. "jerky mouse movement) behavior in FreeBSD 7.0-RC1, I have come up with a reliable way to cause it to happen, and I have created a longer trace showing the results. Note that I am using the ULE scheduler. In general, it becomes easier to see the effect if there is CPU activity. I have noticed it during kernel compiles, while at the same time loading web pages in firefox that contain images (and moving the mouse while this is happening). But a more controlled way to see it is to run something that uses some CPU and then generating lots of X events. In my case, I start "xtrs" (TRS-80 emulator) in Model IV mode, which happens to poll for input, using the CPU. Then I move the mouse back and forth quickly between windows in "focus under mouse" mode (in my case, a KDE focus mode), which causes many focus events quickly. In about 15 or 20 seconds, the mouse reliably starts to show erratic movement, not moving smoothly. I really hope this can shed more light on what might be going on. Here is the trace: http://www.skyrush.com/downloads/ktr_ule_4.out Thanks, Joe
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