From: Roger Larsson <roger.larsson@norran.net>
To: David Jander <david.jander@protonic.nl>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: Kernel 2.6 on MPC8xx performance trouble...
Date: Fri, 28 Oct 2005 20:44:43 +0200 [thread overview]
Message-ID: <200510282044.43523.roger.larsson@norran.net> (raw)
In-Reply-To: <200510281257.22650.david.jander@protonic.nl>
On Friday 28 October 2005 12.57, David Jander wrote:
> They are just integers with fixed start values. These are in the loop, so
> it's not an empty loop and hopefully the compiler won't out-optimize it so
> easily (that is of course without specifying any optimization flags).
> Please don't tell me it's a lousy benchmark, because I already know that!
> Be it as lousy as it is, I shouldn't get _those_ results IMHO.
>
> I have downloaded nbench (hopefully a more serious benchmark for raw
> computing power), and the results are as follows (I deliberately excluded
> tests that don't make sense (ie. use FP)):
>
> Kernel 2.4.25:
>
> TEST : Iterations/sec. : Old Index : New Index
>
> : : Pentium 90* : AMD K6/233*
>
> --------------------:------------------:-------------:------------
> NUMERIC SORT : 30.438 : 0.78 : 0.26
> STRING SORT : 1.5842 : 0.71 : 0.11
> BITFIELD : 7.9506e+06 : 1.36 : 0.28
> FP EMULATION : 3.258 : 1.56 : 0.36
> IDEA : 108.89 : 1.67 : 0.49
>
> Kernel 2.6.14-r5:
>
> TEST : Iterations/sec. : Old Index : New Index
>
> : : Pentium 90* : AMD K6/233*
>
> --------------------:------------------:-------------:------------
> NUMERIC SORT : 21.042 : 0.54 : 0.18
> STRING SORT : 0.88215 : 0.39 : 0.06
> BITFIELD : 6.0979e+06 : 1.05 : 0.22
> FP EMULATION : 1.6453 : 0.79 : 0.18
> IDEA : 110.25 : 1.69 : 0.50
>
>
What about the Pentium 90 and AMD K6? Are those values actual measured
results? By you? If not why do THEY differ between the kernel versions?
Is this a MPC8xx problem - can it be verified on a x86?
/RogerL
next prev parent reply other threads:[~2005-10-28 18:44 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-28 6:57 Kernel 2.6 on MPC8xx performance trouble David Jander
2005-10-28 9:36 ` Roger Larsson
2005-10-28 10:57 ` David Jander
2005-10-28 18:44 ` Roger Larsson [this message]
2005-10-28 20:37 ` Wolfgang Denk
2005-10-31 9:31 ` David Jander
2005-10-28 15:30 ` Marcelo Tosatti
2005-10-31 8:21 ` David Jander
2005-10-31 12:58 ` Mark Chambers
2005-10-31 13:08 ` David Jander
2005-10-31 15:29 ` David Jander
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