Re: headsup: swap_pager.c

From: Greg 'groggy' Lehey (grog_at_FreeBSD.org)
Date: 08/05/03

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    Date: Tue, 5 Aug 2003 10:25:24 +0930
To: Poul-Henning Kamp <phk@phk.freebsd.dk>

    On Friday, 1 August 2003 at 9:06:18 +0200, Poul-Henning Kamp wrote:
    > In message <Pine.NEB.3.96L.1030731190517.85739A-100000@fledge.watson.org>, Robe
    > rt Watson writes:
    >>
    >> On Thu, 31 Jul 2003, Poul-Henning Kamp wrote:
    >>
    >>> I am in the process of changing the on-disk layout policy used by the
    >>> swap_pager.
    >>
    >> Do you anticipate any performance changes as a result of this change?
    >
    > Anticipate ? No.
    > Be surprised by improvements ? No.
    >
    > The striping code limits the I/O size for paging activity to a small
    > size. By laying out each disk sequentially in the "swap device" we
    > can increase that size to what our I/O system can lift.

    I'd expect a significant improvement. In our environment, throughput
    is almost linearly related to request size, so anything to increase
    the transfer size should improve the situation.

    Greg 

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