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    SubjectRE: Slow down across kernels
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    From
    This is unreal! 
    Have you tried 2.6.5 by the way?
    What is it you are benchmarking if you can say?


    -----Original Message-----
    From: linux-kernel-owner@vger.kernel.org
    [mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Phy Prabab
    Sent: Sunday, May 23, 2004 3:24 PM
    To: linux-kernel@vger.kernel.org
    Subject: Slow down across kernels

    Hello,

    Please cc me as I am not on this mailing list.

    I have an issue with the 2.6 kernels that I am unable
    to understand and correct.

    I have a custom binary that I have used to compile
    across different kernel versions and I am getting
    vildly different numbers:
    (as reported by time):

    2.4.21-9 ~45s
    2.4.22 ~55s
    2.6.1 ~3m.40s
    2.6.2 ~4m.00
    2.6.3 ~4m.00
    2.6.6 ~3m.15s
    2.6.6-mm4 ~1m.30s

    It is most shocking how much more time is spent in
    user/kernel in comparsion:
    2.4.21-9

    5.09user 9.04system 0:43.79elapsed 32%CPU
    (0avgtext+0avgdata 0maxresident)k
    0inputs+0outputs (7378946major+1139090minor)pagefaults
    0swaps

    VS.

    2.6.6-mm4

    13.06user 23.80system 1:32.00elapsed 40%CPU
    (0avgtext+0avgdata 0maxresident)k
    0inputs+0outputs (0major+7537027minor)pagefaults
    0swaps


    The system is AMD Opteron 246 w/12G RAM and broadcom
    Ge. To rule out network issues, I have moved the
    files to the local files system, ext2 on a UW320
    drive.

    I have also tested this on a dual Xeon 3.06GHz w/8G
    RAM ge with very similar results in differences across
    the kernels.

    strace and make -d show no major differences.

    Kernels are built with gcc323/340 and bintuils
    2.13.2.1.

    Could someone help me understand what is at issue
    here?

    Thank you and appreciate the help.
    Phy







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