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    SubjectRe: 2.6.23 performance regression

    * Nick Piggin <nickpiggin@yahoo.com.au> wrote:

    > On Tuesday 30 October 2007 18:54, Lorenzo Allegrucci wrote:
    > > Hi, sorry if this is a faq but reading
    > > http://people.freebsd.org/~kris/scaling/7.0%20Preview.pdf (slides 17,
    > > 18)
    > > looks like 2.6.23 is having a performance regression on MySQL and
    > > PostgreSQL benchmarks. Has anyone investigated these?
    >
    > I think Ingo was looking into them. I'm just in the middle of building
    > a new setup to investigate some performance issues too, so I hope to
    > look at this.
    >
    > Apparently it did go unnoticed during CFS testing, unfortunately.
    > Although now it has been brought to light, I think 2.6.24 is supposed
    > to be better (although it now gets worse on other things).

    yep. For those who fear the 1 million lines of code flux of 2.6.24,
    here's a backport of the scheduler changes to 2.6.23:

    http://people.redhat.com/mingo/cfs-scheduler/devel/sched-cfs-v2.6.23.1-v22.1-rc0.patch

    Lorenzo, could you please try that report back your reports? Thanks,

    Ingo
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