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QNX Operating System/Discussion/OSTech/benchmark runs slow on PPC, but ok on x86/List of Posts
Forum Topic - benchmark runs slow on PPC, but ok on x86: (6 Items)
   
Update
Keith Odell
03/05/2008 11:20 AM
post5530
benchmark runs slow on PPC, but ok on x86   
This benchmark runs on Neutrino about the same as it does on Linux on x86, but it (appears that it) runs much more 
slowly on PPC.

I took a quick look at the code, and I don't see a reason.

Anyone see what the difference might be?

Thanks,
Keith
Attachment: Text stream.c 11.46 KB
Brian Stecher
03/05/2008 12:02 PM
post5533
Re: benchmark runs slow on PPC, but ok on x86   
On Wed, Mar 05, 2008 at 11:21:01AM -0500, Keith Odell wrote:
> This benchmark runs on Neutrino about the same as it does on Linux on x86,
but it (appears that it) runs much more slowly on PPC.

What PPC chip are you running it on?


-- 
Brian Stecher (bstecher@qnx.com)        QNX Software Systems
phone: +1 (613) 591-0931 (voice)        175 Terence Matthews Cr.
       +1 (613) 591-3579 (fax)          Kanata, Ontario, Canada K2M 1W8
Keith Odell
03/06/2008 7:32 AM
post5574
Re: benchmark runs slow on PPC, but ok on x86   
I'm running on a AMCC PPc440epx.
Brian Stecher
03/06/2008 8:34 AM
post5577
Re: benchmark runs slow on PPC, but ok on x86   
On Thu, Mar 06, 2008 at 07:32:46AM -0500, Keith Odell wrote:
> I'm running on a AMCC PPc440epx.

The initial Book E processors did not have hardware floating point,
so there was no support added to procnto-booke (since we couldn't test
it). Once there was a CPU with FPU hardware, we added support to procnto,
but I'm not sure if it's been made available as a patch yet. Check the
output of "pidin info". If the string "FPU" does not appear at the end of
the
second line, you're not using the hardware for floating point operations,
which will explain your slowdown.

	Brian

-- 
Brian Stecher (bstecher@qnx.com)        QNX Software Systems
phone: +1 (613) 591-0931 (voice)        175 Terence Matthews Cr.
       +1 (613) 591-3579 (fax)          Kanata, Ontario, Canada K2M 1W8
Keith Odell
03/06/2008 1:03 PM
post5597
Re: benchmark runs slow on PPC, but ok on x86   
Thanks Brian,

It appears I am not using the FPU.  Who can I talk to about finding the status of the patch for running the AMCC440epx 
FPU?

Best regards,
Keith
Brian Stecher
03/07/2008 9:10 AM
post5613
Re: benchmark runs slow on PPC, but ok on x86   
On Thu, Mar 06, 2008 at 01:03:54PM -0500, Keith Odell wrote:
> It appears I am not using the FPU.  Who can I talk to about finding the 
> status of the patch for running the AMCC440epx FPU?

I can't see the patch accessable anywhere, so probably the best person
is your sales rep.

	Brian

-- 
Brian Stecher (bstecher@qnx.com)        QNX Software Systems
phone: +1 (613) 591-0931 (voice)        175 Terence Matthews Cr.
       +1 (613) 591-3579 (fax)          Kanata, Ontario, Canada K2M 1W8

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