> > 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.
Maybe a pluggable read-ahead system could be implemented.
Folkert van Heusden
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