Re: Possible regression with 2.6.0-test6

[Nick Piggin]

Stephen Anthony wrote:

> I've noticed that test6 isn't as 'smooth' as test5.  Specifically, if I 
> open an nedit window and use the cursor down key to scroll down through 
> text, there is some jerkiness.  At this point I've noticed that CPU use 
> goes to 1% or more.  A similar problem happens with Opera (web browser), 
> but of course the CPU usage is higher, which is expected.
>
> When I go back to test5, scrolling in nedit is smoother, and CPU never 
> goes above 0.6%.  Note that the speed that text moves is the same in 
> both, but the test6 version 'jumps' and 'stops' for a little bit.  Hence 
> my describing it as jerky.
>
> I know its not much to go on, but it is a noticable difference, at least 
> to me.  Since this new release has tweaked interactivity patches, I'm 
> wondering if this has anything to do with it.
>
> System is a fully updated Mandrake 9.1, but I don't think that would 
> matter.  CPU is P4-2.4GHz with 768 MB RAM, and NVidia video card.

Hi Stephen, the new CPU scheduler is likely to be the change. You need
to first make sure your X server is not reniced to -10 (should be at 0).

If that fails to help, then you could try my scheduler (with X at -10!)
http://www.kerneltrap.org/~npiggin/v15a/sched-rollup-v15a-260t6.gz

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