Messages in this thread | | | Date | Fri, 26 May 2006 09:25:44 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH 00/33] Adaptive read-ahead V12 |
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Andi Kleen <ak@suse.de> wrote: > > Andrew Morton <akpm@osdl.org> writes: > > > > These are nice-looking numbers, but one wonders. If optimising readahead > > makes this much difference to postgresql performance then postgresql should > > be doing the readahead itself, rather than relying upon the kernel's > > ability to guess what the application will be doing in the future. Because > > surely the database can do a better job of that than the kernel. > > With that argument we should remove all readahead from the kernel? > Because it's already trying to guess what the application will do. > > I suspect it's better to have good readahead code in the kernel > than in a zillion application. >
Wu: "this readahead patch speeds up postgres"
Me: "but postgres could be sped up even more via X"
everyone: "ah, you're saying that's a reason for not altering readahead!".
Would everyone *please* stop being so completely and utterly thick?
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