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    SubjectVery poor performance with 2.6.4

    I tested kernel 2.6.4. While compiling kdelibs and kdebase, I felt, that
    kernel 2.6 seems to be slower than 2.4.25.

    So I did some tests to compare the performance directly. Therefore I
    rebooted for everey test in init 2 (no X).

    I locally compiled 2.6.5rc2 3 times under 2.6.4 and under 2.4.25 on a
    reiserfs LVM partition, which resides onto a IDE HD (using DMA) and got
    the following result:

    In the middle, compiling under kernel 2.6.4 tooks 9.3% more real time than
    under 2.4.25.
    The user-processortime is about the same, but the system-processortime is
    under 2.6.4 32.9% higher than under 2.4.25.

    Now, I switched off preemption. But the performance isn't much better:
    8.8% (9.3% with preemption) more real-time compared to 2.4.25 and 28%
    (32.9% with preepmtion) more system-time.

    Does anybody know, how to get the same performance under 2.6.4 (or even
    better) as under 2.4.25?

    My hardware:
    AMD Athlon(tm) XP 2000+

    00:00.0 Host bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo KT266/A/333]
    00:01.0 PCI bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo KT266/A/333 AGP]
    00:09.0 Ethernet controller: Silicon Integrated Systems [SiS] SiS900
    10/100 Ethernet (rev 02)
    00:0c.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 0c)
    00:10.0 USB Controller: VIA Technologies, Inc. USB (rev 80)
    00:10.1 USB Controller: VIA Technologies, Inc. USB (rev 80)
    00:10.2 USB Controller: VIA Technologies, Inc. USB (rev 80)
    00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82)
    00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge
    00:11.1 IDE interface: VIA Technologies, Inc.
    VT82C586A/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE (rev 06)
    00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235
    AC97 Audio Controller (rev 50)
    01:00.0 VGA compatible controller: ATI Technologies Inc Rage 128 PF/PRO
    AGP 4x TMDS

    Andreas Hartmann

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