Poor performance with 2.5.52, load and process in D state
From: Andrew Morton <[email protected]>
Quoted 9 lines
Quoted 5 lines · Paolo Ciarrocchi
Quoted 3 lines
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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