Messages in this thread | | | Date | Sat, 20 Dec 2003 11:21:23 +1100 | From | Nick Piggin <> | Subject | Re: 2.6 vs 2.4 regression when running gnomemeeting |
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Christian Meder wrote:
>On Fri, 2003-12-19 at 21:32, William Lee Irwin III wrote: > >>On Fri, Dec 19, 2003 at 09:11:50PM +0100, Christian Meder wrote: >> >>>I've got a longstanding regression in gnomemeeting usage when switching >>>between 2.4 and 2.6 kernels. >>>Phenomenon: >>>Without load gnomemeeting VOIP connections are fine. As soon as some >>>load like a kernel compile is put on the laptop the gnomemeeting audio >>>stream is cut to pieces and gets unintelligible . On 2.4.2x I don't get >>>even the slightest distortion in the audio stream under load. I played >>>around with different nice levels with no success. The problem persisted >>>during the whole 2.6.0-test series no matter whether I used -mm kernels >>>or pristine Linus kernels. Even when nicing the kernel compile to +19 >>>the distortions start right away. I tried Nick Piggin's scheduler which >>>fared slightly better after changing the nice level of gnomemeeting to >>>-10 but it's still a far cry from the 2.4.2x feeling without any >>>fiddling with nice values. >>>Any hints where to start looking are greatly appreciated. >>> >>Please instrument your workload with the following, and send logs of the >>output (preferably compressed) to me and possibly others: >> >>top b d 5 >>vmstat 5 >>while true; do cat /proc/vmstat; sleep 5; done >>while true; do cat /proc/meminfo; sleep 5; done >> >>A good way to log commands like this is: >> >>(command) > /home/foo.log.1 2>&1 & >> >>where parentheses surround the command in the actual shell input. >> > >Hi, > >I've attached the tarred output of a gnomemeeting run without load and >without distortions and another tarred output of a gnomemeeting run >while compiling a kernel with severe distortions in the audio stream. >
You're getting a lot fewer interrupts in the loaded case. Maybe its the sound card driver that has the regression from 2.4? It could be that 2.6 allows a smaller sound fragment size which is more stressful.
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