Re: [2.4.17/18pre] VM and swap - it's really unusable

Andrea Arcangeli
2002-01-14T11:40:27Z

On Sun, Jan 13, 2002 at 01:22:57PM -0500, Robert Love wrote:
> On Sun, 2002-01-13 at 12:42, jogi@planetzork.ping.de wrote:
>
> > 13-pre5aa1 18-pre2aa2 18-pre3 18-pre3s 18-pre3sp 18-pre3minill
> > j100: 6:59.79 78% 7:07.62 76% * 6:39.55 81% 6:24.79 83% *
> > j100: 7:03.39 77% 8:10.04 66% * 8:07.13 66% 6:21.23 83% *
> > j100: 6:40.40 81% 7:43.15 70% * 6:37.46 81% 6:03.68 87% *
> > j100: 7:45.12 70% 7:11.59 75% * 7:14.46 74% 6:06.98 87% *
> > j100: 6:56.71 79% 7:36.12 71% * 6:26.59 83% 6:11.30 86% *
> >
> > j75: 6:22.33 85% 6:42.50 81% 6:48.83 80% 6:01.61 89% 5:42.66 93% 7:07.56 77%
> > j75: 6:41.47 81% 7:19.79 74% 6:49.43 79% 5:59.82 89% 6:00.83 88% 7:17.15 74%
> > j75: 6:10.32 88% 6:44.98 80% 7:01.01 77% 6:02.99 88% 5:48.00 91% 6:47.48 80%
> > j75: 6:28.55 84% 6:44.21 80% 9:33.78 57% 6:19.83 85% 5:49.07 91% 6:34.02 83%
> > j75: 6:17.15 86% 6:46.58 80% 7:24.52 73% 6:23.50 84% 5:58.06 88% 7:01.39 77%
>
> Again, preempt seems to reign supreme. Where is all the information

those comparison are totally flawed. There's nothing to compare in
there.

minill misses the O(1) scheduler, and -aa has faster vm etc... there's
absolutely nothing to compare in the above numbers, all variables
changes at the same time.

I'm amazed I've to say this, but in short:

1) to compare minill with preempt, apply both patches to 18-pre3, as the
only patch applied (no O(1) in the way of preempt!!!!)
2) to compare -aa with preempt, apply -preempt on top of -aa and see
what difference it makes

If you don't follow exactly those simple rules you will change an huge
amount of variables at the same time, and it will be again impossible to
make any comparison or deduction from the numbers.

Andrea