Re: 2.5.70-mm6

From: Mike Galbraith (
Date: Tue Jun 10 2003 - 06:31:32 EST

At 02:20 AM 6/10/2003 -0700, William Lee Irwin III wrote:
>At some point in the past, I wrote:
> >> How about one or the other of these two? (not both at once, though,
> >> they appear to clash).
>On Tue, Jun 10, 2003 at 10:54:55AM +0200, Maciej Soltysiak wrote:
> > Success, no audio skipps with galbraith.patch and mm6.

(victim of fast hw methinks. dog slow old isa card will probably work fine)

>Mike, any chance you can turn your series of patches into one that
>applies atop mingo's intra-timeslice priority preemption patch? If
>not, I suppose someone else could.

I've never seen it. Is this the test-starve fix I heard mentioned on lkml

>There also appears to be some kind of issue with using monotonic_clock()
>with timer_pit as well as some locking overhead concerns. Something
>should probably be done about those things before trying to merge the
>fine-grained time accounting patch.

Ingo had me measure impact with lat_ctx, and it wasn't very encouraging
(and my box is UP). I'm not sure that I wasn't seeing some cache effects
though, because the numbers jumped around quite a bit. Per Ingo, the
sequence lock change will greatly improve scalability. Doing anything
extra in that path is going to cost some pain though, so I'm trying to
figure out a way to do something ~similar. (ala perfect is the enemy of
good mantra).

wrt pit, yeah, that diff won't work if you don't have a tsc. If something
like it were used, it'd have to have ifdefs to continue using
jiffies. (the other option being only presentable on April 1:)


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