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    SubjectSLAB vs. SLUB tbench regression (Was: [tbench regression fixes]: digging out smelly deadmen.)
    Hi Evgeniy,

    On Fri, Oct 10, 2008 at 1:17 AM, Evgeniy Polyakov
    <> wrote:
    > It was reported recently that tbench has a long history of regressions,
    > starting at least from 2.6.23 kernel. I verified that in my test
    > environment tbench 'lost' more than 100 MB/s from 470 down to 355
    > between at least 2.6.24 and 2.6.27. 2.6.26-2.6.27 performance regression
    > in my machines is rougly corresponds to 375 down to 355 MB/s.

    As you've already pointed out in private and in your blog, some part
    of the tbench regression comes from SLUB vs. SLAB as well. Looks like
    I can reproduce the regression locally as well:

    [ 8 clients and tbench_srv on the same machine on 2-way x86-64 ]

    min max avg sd
    2.6.28-rc2-slab 234.57 244.88 242.68 0.71
    2.6.28-rc2-slub 227.44 240.90 239.08 0.78

    Oprofile seems to be busted for 2.6.28-rc2 so I'll follow up on this
    as soon as that's settled.

    Btw, just as one more data point, I accidentally tested with just 2
    clients at first and SLUB actually beat SLAB.


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