Re: 2.6.1 slower than 2.4, smp/scsi/sw-raid/reiserfs

[Andrew Morton <akpm _at_ xxxxxxxx>]

Philip Martin <philip _at_ codematters.co.uk> wrote:
>
> The machine is a dual P3 450MHz, 512MB, aic7xxx, 2 disk RAID-0 and
>  ReiserFS.  It's a few years old and has always run Linux, most
>  recently 2.4.24.  I decided to try 2.6.1 and the performance is
>  disappointing.

2.6 has a few performance problems under heavy pageout at present.  Nick
Piggin has some patches which largely fix it up.

>  My test is a software build of about 200 source files (written in C)
>  that I usually build using "nice make -j4".

Tried -j3?

> Timing the build on
>  2.4.24 I typically get something like
> 
>  242.27user 81.06system 2:44.18elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
>  0inputs+0outputs (1742270major+1942279minor)pagefaults 0swaps
> 
>  and on 2.6.1 I get
> 
>  244.08user 116.33system 3:27.40elapsed 173%CPU (0avgtext+0avgdata 0maxresident)k
>  0inputs+0outputs (0major+3763670minor)pagefaults 0swaps

hm, the major fault accounting is wrong.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo _at_ vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/