Re: Kernel 2.6 with X (xorg) 4.4 (eats more CPU power)

[Arjan van de Ven <arjan@infradead.org>]

On Wed, 2004-12-01 at 18:21 +0800, Joe Hsu wrote:

>     And I found something interisting happened. In pentium 4
> 3.0G machine and linux kernel 2.6, X and my program total 
> consumes 5% of cpu resource.
> 
>     But in pentium 4 2.xG or below, it would consume 10% or 
> more of CPU resource. (If you try this with XFree86 4.2 and 
> pentium 1.xG machine, it would consume 30% or more of cpu 
> resource at a peak.)
> 
>     In contrast, I've tried Kernel 2.4 with same X, same 
> program, and same machine. It consumes almost zero of CPU 
> resource( no matter it runs on a P4 1.xG or P4 3.0G and no
> matter it runs on 4.4 or 4.2 X-server).
> 
>     Same phenomenon happened when I ran 4 mpeg4 playback 
> programs (each 320x240, 30 frames per second, no scaling).
> It seems that these programs and X consume almost zero of 
> CPU power when the KERNEL HZ is 100. (I've 
> tried Robert Love's variable HZ patch to kernel 2.4 and 
> change HZ to 1000........Same phenomenon as 2.6)
> 
>     Could any one explain why??? Thanks.
> (I wish to be personally CC'ed the answers/comments posted 
> to the list in response to your posting 'cause I do not 
> subscribe to this mailing list.)
> 
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