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From"Paolo Ciarrocchi" <>
DateThu, 26 Dec 2002 17:45:37 +0800
SubjectRe: Poor performance with 2.5.52, load and process in D state
From: Andrew Morton <akpm@digeo.com>

> Paolo Ciarrocchi wrote:
> > 
> > > it appears that this benefit came from the special usercopy code.
> > > What sort of CPU are you using?
> > 
> > It is a PIII@800.
> 
> hm, don't know.  I built the latest postgres locally.  Perhaps the
> alignment of some application buffer is different.

I don't know. 
I've built the osdb test while I've just installed postgres
from the Mandrake 9 standard installation (so i586.rpm).

May be we are using different version of postgres...

Anyway, my test show that there is a lack of performance 
in 2.5.* is the kernel fits in a machine with low memory,
any hint ?

And probably the "standard" swappiness value is not the 
optimal, I'd like to see a few tests with the contest
tool ;-)


      Ciao,
               Paolo
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