Kernel 2.6 with X (eats more CPU power)...with test program

[Joe Hsu]

I put my test program on internet.
http://bill-goldberg.myweb.hinet.net/monitor3.tgz

Download and extract it. And then read README.TXT.
It does make difference between different KERNEL HZ.
This program also shows the time it takes to refresh
every 600 frames.(Roughly 10 seconds, both in kernel
2.4 and 2.6)

> 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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