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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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