Messages in this thread | | | From | "Paolo Ciarrocchi" <> | Date | Thu, 26 Dec 2002 17:45:37 +0800 | Subject | Re: Poor performance with 2.5.52, load and process in D state |
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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 -- ______________________________________________ http://www.linuxmail.org/ Now with POP3/IMAP access for only US$19.95/yr
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