Hi! > > 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 - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
