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    SubjectRe: Very poor performance with 2.6.4
    Andrew Morton wrote:
    > Andreas Hartmann <andihartmann@freenet.de> wrote:
    >>
    >> Now, I tested 2.6.5-rc3-mm4. Same procedure.
    >> The good news first:
    >> 2.6.5-rc3-mm4 is nearly as fast as 2.4.25 - it is about 2% slower than
    >> 2.4.25 (with preemption turned on).
    >>
    >> Now the bad news:
    >> The system-processor-time is unchanged abnormal high: it is 34% (!) higher
    >> than in 2.4.25 (and about 1% more than in 2.4.6).
    >>
    >>
    >> Btw: Did the other profile outputs help to find the problem?
    >>
    >> These are the profile-values for an example run (make of kernel 2.6.5rc2)
    >> with 2.6.5rc3mm4:
    >
    > Spending a lot of time on do_softirq() while compiling stuff is peculiar.
    >
    > What device drivers are running at the time? disk/network/usb/etc?

    Module Size Used by Not tainted
    eepro100 19828 1 (autoclean)
    mii 2480 0 (autoclean) [eepro100]
    sis900 13036 1 (autoclean)
    crc32 2880 0 (autoclean) [sis900]
    usb-storage 26416 0 (unused)
    scsi_mod 87488 0 [usb-storage]
    uhci 25436 0 (unused)
    usbcore 62316 0 [usb-storage uhci]
    lvm-mod 44416 12 (autoclean)
    unix 15308 13 (autoclean)

    These are all modules (drivers), which are running - in both cases (2.4.25
    and 2.6.x).


    Regards,
    Andreas Hartmann
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