Messages in this thread | | | Date | Sat, 22 May 2004 17:27:24 -0700 | From | Andrew Morton <> | Subject | Re: 2.6 high CPU utilization with multimedia apps {Scanned} |
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rettw@rtwnetwork.com wrote: > > I have noticed and have read several reports on the net > regarding CPU utilization differences (top displays) when > running multimedia apps on 2.6 versus late 2.4 kernels. > 2.6 running xine/mplayer/vlc etc uses 2-4 times more CPU > than 2.4.24 running the very same applications/media. > Some of the CPU appears tied up in the "X" process (I am > using the xvideo extension), the rest in the app itself. > I have seen this on every machine I have tested 2.6 on, > all with 2Ghz+ CPUs. I have tested 2.6.4, 2.6.5, 2.6.6 > vanilla kernels from kernel.org
This could be an artifact from the instrumentation - if the application is doing short bursts of work the 1000Hz clock may be providing more accurate sampling.
In 2.6, edit include/asm/param.h and set HZ to 100 and then redo the measurement.
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