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    SubjectRe: 2.6 kernel series have noticeable performance regression
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    LMbench
    http://sourceforge.net/projects/lmbench

    Netperf
    ftp://ftp.cup.hp.com/dist/networking/benchmarks/netperf/

    > Hi,
    >
    > Can we have the program/script you used to make your measures ?
    >
    > Thanks.
    >
    >
    > On 6/14/05, yangyi <yang.yi@bmrtech.com> wrote:
    > > Hi, All
    > >
    > > I did a performance regression test for all the 2.6 kernel series on two
    > > x86 platforms in last two weeks and found that some version kernels do
    > > have noticeable performance regression, some performance indices have
    > > about 20 to 30 percent regression,
    > > even several indices have over 30 percent fall.
    > >
    > > For example, on Toshiba tecra8000 laptop: for 4-bytes packet, network
    > > throughput of 2.6.11 is just about 57.5 percent of 2.6.0, for pipe
    > > bandwidth, the value of 2.6.11 is just about 68 percent of that value of
    > > 2.6.0, for mmap latency, the value of 2.6.11 is about 1.8 times as long
    > > as 2.6.0.
    > >
    > > On supermicro-6012-p6, for 64-bytes small packet, network throughput of
    > > 2.6.11 is about 66.72 percent of 2.6.0, for 0K-size 2 processes context
    > > switch time, 2.6.11 is 31.8 percent bigger than 2.6.0, for pipe latency,
    > > 2.6.10 is 35.85 percent bigger than 2.6.3.
    > >
    > > So, I think that it is very very necessary to find the problems and fix
    > > them ASAP.
    > >
    > > The following articles give out all the test results, the article "2.6
    > > kernel series have noticeable performance regression, part 1" gives out
    > > the test results on SuperMicro-6012-p6, the article "2.6 kernel series
    > > have noticeable performance regression, part 2" gives out the test
    > > results on Toshiba tecra8000 laptop.
    > >
    > >
    > > -
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    >

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