Hi!

quoted text
> > I guess I should try to measure it. (Linux already does writeback
> > caching, with 2GB of memory. I wonder how important disks's 2MB of
> > cache can be).
> 
> It serves essentially the same purpose as the 'async' option in /etc/exports
> (i.e. we declare it "done" when the other end of the wire says it's caught
> the data, not when it's actually committed), with similar latency wins.  Of
> course, it's impedance-matching for bursty traffic - the 2M doesn't do much
> at all if you're streaming data to it.  For what it's worth, the 80G Seagate
> drive in my laptop claims it has 8M, so it probably does 4 times as much
> good as 2M. ;)

I doubt "impedance-matching" is useful here. SATA link is fast/low
latency, and kernel already does buffering with main memory...

Hmm... what is the way to measure that? Tar decompress kernel few
times with cache on / cache off?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/