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SubjectRe: 2.6 high CPU utilization with multimedia apps {Scanned}
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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