Re: ata (raid) patches

From: Michael Butler (imbutler_at_comcast.net)
Date: 11/27/05

  • Next message: ebm: "Freebsd 5.3 screw up.... deleted /lib/libc.so.5" 
    Date: Sun, 27 Nov 2005 17:45:38 -0500
To: Søren Schmidt <sos@FreeBSD.ORG>

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    Søren Schmidt wrote:
    |> 3) another part of this patch is to ata-raid where the choice of drive
    |> from which to read favours one side of a mirror even when both drives
    |> are near the block(s) we want. Because the mirror is on another channel
    |> on the Highpoint controller, it performs (marginally :-() better when we
    |> toggle between them.
    |
    |
    | Hmm, well, depends on what sort of behavior one wants to optimise for. I
    | have a few other patches for optimisations but havn't decided what to
    | eventually use yet. Guess its time for me to run some tests on this..

    On further investigation, I'd failed to notice (doh!) that rdp->toggle
    isn't preserved between requests and that one unobvious side-effect of
    the original code is that it does slightly better than my patched
    version .. <sigh>. I'll rework this and see if I can make it do better,

            Michael
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