Re: Reiser4 status: benchmarked vs. V3 (and ext3)

From: Hans Reiser (reiser_at_namesys.com)
Date: 07/28/03

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    Date:	Mon, 28 Jul 2003 17:29:38 +0400
To: Daniel Egger <degger@fhm.edu>

    Daniel Egger wrote:

    >Am Mon, 2003-07-28 um 14.44 schrieb Hans Reiser:
    >
    >
    >
    >>>This looks fine for normal harddrives put on flash you'd probably like
    >>>to write the data evenly over the free space in some already formatted
    >>>section still leaving the oportunity to format some other sectors to not
    >>>run out of space.
    >>>
    >>>
    >
    >
    >
    >>I was not able to parse the sentence above.;-)
    >>
    >>
    >
    >s/put/but/
    >
    >As already mentioned the flash chips have to be erased before they can
    >be written. The erasesize is much larger than the typical block size
    >which means that although a block doesn't contain valid data it still
    >contains something which means that it cannot be written until it was
    >erased. That's why JFFS2 is using garbage collection to reclaim unused
    >but (at the moment) unusable space.
    >
    >
    >
    >>No, you could be more clever than that.
    >>
    >>
    >
    >Sure. :)
    >
    >
    >
    If you feel ambitious, try increasing the reiser4 node size to equal the
    erase size. This requires changes to VM though. 

    -- 
Hans
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