Re: [RFC] kernel facilities for cache prefetching

On Tue, 2006-05-02 at 16:06 +0800, Wu Fengguang wrote:
On Tue, May 02, 2006 at 09:58:44AM +0200, Arjan van de Ven wrote:


PREVIOUS WORKS

There has been some similar efforts, i.e.
- Linux: Boot Time Speedups Through Precaching
http://kerneltrap.org/node/2157
- Andrew Morton's kernel module solution
http://www.zip.com.au/~akpm/linux/fboot.tar.gz
- preload - adaptive readahead daemon
http://sourceforge.net/projects/preload

you missed the solution Fedora deploys since over a year using readahead

Thanks, and sorry for more previous works that I failed to mention here :)

one interesting thing that came out of the fedora readahead work is that
most of the bootup isn't actually IO bound. My test machine for example
can load all the data into ram in about 10 seconds, so that the rest of
the boot is basically IO-less. But that still takes 2 minutes....
So I'm not entirely sure how much you can win by just attacking this.

Another interesting approach would be to actually put all the data you
want to use in a non-fragmented, sequential area on disk somehow (there
is an OLS paper submitted about that by Ben) so that at least the disk
side is seekless...

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