From: "Paolo Ciarrocchi" <ciarrocchi@linuxmail.org>
To: akpm@digeo.com, ciarrocchi@linuxmail.org
Cc: vda@port.imtp.ilyichevsk.odessa.ua, conman@kolivas.net,
riel@conectiva.com.br, linux-kernel@vger.kernel.org
Subject: Re: Poor performance with 2.5.52, load and process in D state
Date: Thu, 26 Dec 2002 17:45:37 +0800 [thread overview]
Message-ID: <20021226094537.20498.qmail@linuxmail.org> (raw)
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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next reply other threads:[~2002-12-26 9:37 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-26 9:45 Paolo Ciarrocchi [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-12-26 9:26 Poor performance with 2.5.52, load and process in D state Paolo Ciarrocchi
2002-12-26 9:34 ` Andrew Morton
2002-12-26 0:03 Paolo Ciarrocchi
2002-12-26 7:44 ` Andrew Morton
2002-12-23 12:44 Paolo Ciarrocchi
2002-12-22 17:09 Paolo Ciarrocchi
2002-12-22 11:37 Paolo Ciarrocchi
2002-12-23 11:29 ` Andrew Morton
2002-12-25 13:12 ` Denis Vlasenko
2002-12-25 8:41 ` Andrew Morton
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