Re: Lower-latency kernels?
On Tue, 2002-06-04 at 00:16, Christian Jaeger wrote:
>
> 2.) I am now running 2.4.18 with
> http://penguinppc.org/~eb/files/2.4.18-elf-fix.patch and
> 2.4.18-rc1-low-latency.patch from Andrew Morton's Website
> (zipworld.com.au something) (and also the attached one). It runs,
> also mol is no problem; however: I've compiled it with the sysctl in
> /proc, and tried switching with
> echo 1 > /proc/sys/kernel/lowlatency
> or echo 0 > ...
> but haven't noticed any difference whatsoever yet. I've mainly tried
> untarring kernel tarballs and copying around with or without nice and
> at the same time dragged a window around in X. The window is sluggish
> either way during phases where it seems the CPU is working and not
> the disk. Now I would have expected that since X runs with elevated
> priority (-10) it should profit from lower latency.
Beware that the window manager (and possibly other clients when their windows
get exposed) is also involved when moving windows.
> I guess lowlat only helps for realtime priority processes?
Maybe, or I guess it rather decreases worst-case latencies but doesn't
necessarily help in the average case.
> Maybe the O(1) schedular would help more in that case?
I doubt it, I understand it mostly makes a difference with lots of processes
running on multiple CPUs. But why not try? :)
--
Earthling Michel Dänzer (MrCooper)/ Debian GNU/Linux (powerpc) developer
XFree86 and DRI project member / CS student, Free Software enthusiast
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