Re: large files unnecessary trashing filesystem cache?

[gfiala@s.netic.de]

Zitat von Andrew James Wade <andrew.j.wade@gmail.com>:
> > For example, the person whose application does repeated linear reads of
> the
> > first 100MB of a 4G file will get very upset.
> 
> As will any dumb heuristic for that matter; we'd need precognition[1] to
> avoid
> all of them. But we can hopefully make the failure modes rarer and more
> predictable. I don't know how my proposal would fare, and as I do not have
> the code to test the matter I think I shall drop it.
> 
> [1] Which could, on occasion, be provided by hinting.

That is why i said it should be configurable by root via proc/sys/kernel 
interface - if the system is intended to primarily run a database, set it to a 
different heuristic than to "desktop/multimedia-workstation".

Much like the recent IO-scheduler additions (do they affect this behaviour?)