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

[Folkert van Heusden]

> > 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

-- 
Ever wonder what is out there? Any alien races? Then please support
the seti@home project: setiathome.ssl.berkeley.edu
----------------------------------------------------------------------
Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/