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DragonFly kernel List (threaded) for 2003-09
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Re: Ridiculous idea: Cache as ramdisk?

To: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
From: Hiten Pandya <hmp@xxxxxxxxxxxxx>
Date: Tue, 23 Sep 2003 20:17:20 +0100

Matthew Dillon wrote:
>	[ ... great explanations snipped 8-) ... ]
    The MFS filesystem comes fairly close to doing this already since
    its backing store is simply the memory associated with a process, but
    it has the disadvantage of causing data to be stored in memory twice
    (once in the VM / buffer cache, once in the MFS's procs memory space).
    Despite the duplication of data, the fact that MFS filesystems do not
    automaticaly flush data to a physical storage device has proven to be
    a huge performance advantage over the years.

    So, in short, we already have the pieces, we just have to get them to
    fit together in a reasonable way.

Well, the problem about storing data twice will only affect us as long as we don't have a Slab Cache, [Bonwick94, Bonwick2001] but once that is in place, we will be much better off, memory allocation wise...


Hiten Pandya

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