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    SubjectRe: [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck)
    On Tue 2008-01-15 18:44:26, Daniel Phillips wrote:
    > On Jan 15, 2008 6:07 PM, Pavel Machek <pavel@ucw.cz> wrote:
    > > I had write cache enabled on my main computer. Oops. I guess that
    > > means we do need better documentation.
    >
    > Writeback cache on disk in iteself is not bad, it only gets bad if the
    > disk is not engineered to save all its dirty cache on power loss,
    > using the disk motor as a generator or alternatively a small battery.
    > It would be awfully nice to know which brands fail here, if any,
    > because writeback cache is a big performance booster.

    Is it?

    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).
    Pavel
    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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