Re: Very poor performance with 2.6.4

[Andreas Hartmann <andihartmann@freenet.de>]

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