Re: [RFC] Bumping ufs.dirhash_maxmem to a larger value?

From: Darren Reed (darrenr_at_hub.freebsd.org)
Date: 08/07/05

  • Next message: Suleiman Souhlal: "Re: Tarball of ported libmicro 0.3 available for testing..." 
    Date: Sun, 7 Aug 2005 21:43:38 +0000
To: freebsd-performance@FreeBSD.org

    On Mon, Aug 08, 2005 at 02:51:29AM +0800, Xin LI wrote:
    ...
    > My proposal is to increase the default dirhash_maxmem value to at least
    > 32MB or 64MB. Any objections?
    >
    > Cons for this, discussed in -developer:
    > - dirhash does not implements automatical mechanism to reduce memory
    > usage in response to system memory pressure, and benefits mainly to
    > large directories, e.g. Maildirs.

    So why not make the determination of "dirhash_maxmem" the result of some
    calculation(s) that takes into account RAM size, etc ?

    The obvious lesson here is that picking a number to be a limit based on
    the current size of machines fails the test of time.

    Darren
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  • Next message: Suleiman Souhlal: "Re: Tarball of ported libmicro 0.3 available for testing..."

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