Re: [PATCH 00/33] Adaptive read-ahead V12

[Andi Kleen]

Andrew Morton <akpm@xxxxxxxx> 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.

-Andi
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