> Hi,
>
> Have you checked what happens to disk read performance?
>
> With 2.0.29, and 2.0.30 with Pavel Krauz patch, Bonnie gives something like
>
> -------Sequential Output-------- ---Sequential Input-- --Random--
> -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
> Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
> 100 2259 77.0 4873 28.5 1768 20.5 2119 76.9 4114 20.4 118.8 5.3
>
>
> And with your latest patch with pre-patch 2.0.31-2
>
> -------Sequential Output-------- ---Sequential Input-- --Random--
> -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
> Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
> 100 2262 76.8 4841 30.6 1362 15.5 1445 52.7 1568 7.6 120.1 5.3
>
> Note the drastic fall in read performance. :( These results are consistent.
I rememember the original port of the 2.1 buffer.c into 2.0.30 was inspired
by this read performance problem. Leonard Zubkoff presented a patch for it
at this time. Maybe he knows how to fix it. It *should* be fixed for 2.0.31.
-Andi
>
>
> Richard
>
>
>
> Dr. Werner Fink wrote:
> >
> >
> > Hi,
> >
> > here is the collected patch against pre-patch-2.0.31-2. The buffer code
> > is based on the NEW buffer-code of 2.0.30. I've added some old own and old
> > foreign changes (let's look into http://www.linuxhq.com/patch/20-p0595.html):
> >
>
>
> --
> Richard Waltham | Work: richard@digtalinterface.demon.co.uk
> At home in | Home: dormouse@farsrobt.demon.co.uk
> Southampton UK | Compuserve 100421.1276