Messages in this thread | | | Subject | Re: [PATCH 00/33] Adaptive read-ahead V12 | From | Andi Kleen <> | Date | 26 May 2006 16:00:14 +0200 |
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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.
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