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    SubjectRe: PATCH] cpuidle: A new variant of the menu governor to boost IO performance
    On Fri, Sep 11 2009, Arjan van de Ven wrote:
    > From: Arjan van de Ven <arjan@linux.intel.com>
    > Subject: [PATCH] cpuidle: A new variant of the menu governor
    >
    > This patch adds a new idle governor which balances power savings,
    > energy efficiency and performance impact.
    >
    > The reason for a reworked governor is that there have been
    > serious performance issues reported with the existing code
    > on Nehalem server systems.
    >
    > To show this I'm sure Andrew wants to see benchmark results:
    > (benchmark is "fio", "no cstates" is using "idle=poll")
    >
    > no cstates current linux new algorithm
    > 1 disk 107 Mb/s 85 Mb/s 105 Mb/s
    > 2 disks 215 Mb/s 123 Mb/s 209 Mb/s
    > 12 disks 590 Mb/s 320 Mb/s 585 Mb/s

    Heh that's interesting, I have noticed some oddities that I haven't
    pursued further yet. But it was definitely power state related, so I'll
    give your patch spin.

    --
    Jens Axboe



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