Re: CONFIG_PREEMPT and server workloads

[Andrea Arcangeli <andrea@suse.de>]

On Wed, Mar 24, 2004 at 02:57:20PM +0100, Takashi Iwai wrote:
> At Sat, 20 Mar 2004 16:03:11 +0100,
> Andrea Arcangeli wrote:
> > 
> > On Sat, Mar 20, 2004 at 06:51:11AM -0800, William Lee Irwin III wrote:
> > > I may have missed one of his posts where he gave the results from the
> > > RT test suite. I found a list of functions with some kind of numbers,
> > > though I didn't see a description of what those numbers were and was
> > > looking for something more detailed (e.g. the output of the RT
> > > instrumentation things he had with and without preempt). This is all
> > > mostly curiosity and sort of hoping this gets carried out vaguely
> > > scientifically anyway, so I'm not really arguing one way or the other.
> > 
> > agreed. what I've seen so far is a great number of graphs, they were
> > scientific enough for my needs and covering real life different
> > workloads, but I'm not sure what Takashi published exactly, you may want
> > to discuss it with him.
> 
> sorry, there is no exact descrption (yet) in public, except for the
> pdf of slides i presented ago:
> 
> 	http://www.alsa-project.org/~iwai/audio-latency.pdf

this is what I meant. To be fair I've also seen lots of raw input data,
but you represented all the interesting points in the presentation.

> it uses its own kernel module to generate irqs from RTC and to trace
> stacks.
> 
> i'll show the results of the recent kernels tomorrow...

cool ;)