From: Arnd Bergmann <arnd@arndb•de>
To: linuxppc-dev@ozlabs•org
Cc: Milton Miller <miltonm@bga•com>
Subject: Re: 82xx performance
Date: Thu, 17 Jul 2008 21:43:56 +0200 [thread overview]
Message-ID: <200807172143.57576.arnd@arndb.de> (raw)
In-Reply-To: <DCEAAC0833DD314AB0B58112AD99B93B04B34D32@ismail.innsys.innovsys.com>
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 <><
next prev parent reply other threads:[~2008-07-17 19:44 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-14 16:34 82xx performance Rune Torgersen
2008-07-14 20:44 ` Arnd Bergmann
2008-07-15 14:16 ` Rune Torgersen
2008-07-15 18:25 ` Rune Torgersen
2008-07-15 19:50 ` Arnd Bergmann
2008-07-16 21:08 ` Rune Torgersen
2008-07-16 21:45 ` Arnd Bergmann
2008-07-16 21:53 ` Rune Torgersen
2008-07-16 22:32 ` Arnd Bergmann
2008-07-17 15:12 ` Rune Torgersen
2008-07-17 15:47 ` Arnd Bergmann
2008-07-17 15:52 ` Rune Torgersen
2008-07-17 18:24 ` Rune Torgersen
2008-07-17 19:43 ` Arnd Bergmann [this message]
2008-07-17 19:54 ` Rune Torgersen
2008-07-17 21:32 ` Arnd Bergmann
2008-07-25 20:41 ` Rune Torgersen
2008-07-26 3:47 ` Milton Miller
2008-07-15 15:57 ` Milton Miller
2008-07-15 18:12 ` Rune Torgersen
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