On Thursday 17 July 2008, Rune Torgersen wrote:
> Arnd Bergmann wrote:
> > Seeing more hits in handle_mm_fault suggests that you have
> > a higher page fault rate. A trivial reason for this might
> > be that the amount of memory was misdetected in the new
> > code (maybe broken device tree). What is the content of
> > /proc/meminfo after a fresh boot?
> Powerpc
> VmallocTotal: 474756 kB
> Ppc
> VmallocTotal: 245696 kB
This seems to be the only significant difference here, but
I don't see how it can make an impact on performance.
> User time (seconds): 4339.11
> User time (seconds): 4177.11
3.8% slowdown
> System time (seconds): 319.41
> System time (seconds): 295.00
8.2% slowdown
> Elapsed (wall clock) time (h:mm:ss or m:ss): 1:17:42
> Elapsed (wall clock) time (h:mm:ss or m:ss): 1:14:35
4% slowdown
> Minor (reclaiming a frame) page faults: 4213347
> Minor (reclaiming a frame) page faults: 4203103
slightly more faults
> Voluntary context switches: 53543
> Voluntary context switches: 53812
This actually went down by 0.5%, both of these are well within
the expected
> Involuntary context switches: 90165
> Involuntary context switches: 85856
4.8% more context switches, probably a side-effect of the longer
run-time.
So again, nothing conclusive. I'm running out of ideas.
Arnd <><
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