Re: [BENCHMARK] O1int with contest

From: Roberto Orenstein (
Date: Wed Jul 02 2003 - 11:42:18 EST

On Wed, 2003-07-02 at 03:24, Con Kolivas wrote:
> On Wed, 2 Jul 2003 14:26, Roberto Orenstein wrote:
> > Hi guys,
> >
> > Here are some numbers from three kernels tested on my home machine.
> > All threes are 2.5.73 based.
> > Vanilla is a plain one, O1int-0307020011 is the latest (as I last
> > checked) O1int patch w/o the granularity patch, and
> > O1int-granu-0307020011 is the former with granularity.
> Thanks for doing these.
> > One can see that with granularity, the kernel compile suffers a bit, but
> > the response is usually high. In my machine, this was the kernel with
> > the best responsiveness.
> Can you please describe your experiences? The more feedback I get the more I
> can get it working well.
Well, basically I load the machine with some make -j nuts_number_here,
and I do some other things. The vanilla kernel always behaves badly,
with things like switching windows, loading web pages taking a visible
amount of time to get some cpu attention. The others always win. I mean,
for every load, ranging from a make -j5 to a make -j25 the system
_feels_ better than vanilla. With granularity, it was quite noticeable
(but the kernel compiles were noticeable longer too - some you win and
some you loose :-).
As I said to you on IRC, I wasn't able to make xmms skip with any
kernels (does anyone have a recipe for this?), which I guess is the
issue that started this thread.
The only issue I had was with app startup time (although starting a new
X session was indeed faster - strange).

> > Each kernel was run once, except O1int-0307020011 with three iterations.
> > This was the first I tested, and as soon I noticed the time it took, I
> > decided to run once the others 8). Maybe this has some bad influence on
> > the results. I appreciate any comments...
> Ok well here is my summary of the situation. My patch has virtually no effect
> on contest results (except perhaps io_other). This is good because my earlier
> attempts did affect it, and possibly starved some of the loads. Dare I say
> it, contest is not very good at picking up _these_ sort of scheduler tweaks
> unless they do something wrong. Sorry if my system responsiveness benchmark
> doesn't show this effect; I think they're different. This is more about
> picking the right thing to give preference to. There's a long discussion in
> that, but I'll try not to get into it.

Well, if things doesn't get worse, it's already a start, right? :-)
In fact I believe it's moving forward. It feels clearly better than
plain 2.5.73, but I don't know if others share the same view. My tests
weren't very scientific nor realistic, it's just a matter of 'looks
good'. Although I think 'feels good' is sometimes better than a lot of
numbers. If there's a way to get some precise numbers, let me know of
it. I thought that contest was a good choice.

> By the way it doesn't look like your dbench in dbench load actually worked.
Dunno what happened, I've Followed All The Instructions(TM). I'll look
at this later.

> O1int still remains a work in progress.
I'll test your latest patch later to see the improvements. Should I run
another contest on it or doesn't make any difference?


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

This archive was generated by hypermail 2b29 : Mon Jul 07 2003 - 22:00:16 EST