Re: Low-latency/Preemptible/Compressed Cache
On Mon, 2002-11-04 at 19:29, brett@kavi.com wrote:
> Does anybody know if the low latency and preemptible patches work with a
> benh rsync'd kernel? Specifically, I was thinking of giving the
> kernel-patch-ck package a whirl which includes:
> * 0(1) and batch scheduler
> * Preemptible kernel
> * Low-latency
> * Compressed cache
> * Andrea Arcangeli's VM addons
> Mostly all I care about are the preemptible and low-latency patches so I
> can mess around with Jack.
The preemptible kernel patch now supports PPC, but IME it tends to make
things worse, introducing pauses of the better part of a second. This is
a known PPC specific problem which may have been fixed in the latest
patches from
http://www.<CC>.kernel.org/pub/linux/kernel/people/rml/preempt-kernel/v2.4/ though.
I've been using the low latency patch for quite a long time with good
results and no problems, the caveat is that it doesn't patch
arch/ppc/config.in yet so it's not actually used unless you add
CONFIG_LOLAT there.
In fact, /usr/src/kernel-patches/all/ck/ck12_2.4.19.patch.gz doesn't
patch it either, at least low latency and preemption won't be used
unless you change that.
--
Earthling Michel Dänzer (MrCooper)/ Debian GNU/Linux (powerpc) developer
XFree86 and DRI project member / CS student, Free Software enthusiast
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