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List Archive: gentoo-ppc-dev
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To: gentoo-ppc-user@g.o, gentoo-ppc-dev@g.o
From: IsoH <jd@...>
Subject: Re: G5 & missing performance
Date: Fri, 11 Jun 2004 16:26:27 +0300 (EEST)
On Fri, 11 Jun 2004, IsoH wrote:

> On Thu, 10 Jun 2004, Pieter Van den Abeele wrote:
> 
> > is /proc/cpufreq useable on a G5?
> 
>   Perhaps not, but all I now is that missing performance...
> 
>   I have very simple test for that; I first boot with mac-boot+ppc64-livecd
>   and bzipping (bzip -9) test file, which takes 8.8 seconds to compress.
>   Then I boot with yaboot from /dev/sda and repeating same bzipping and
>   now it takes about 12.6 seconds.
>   btw. with ppc32 same test takes about 7.1 seconds.
> 
>   I found out this phenomenon couple months ago when I played
>   with OSX and ppc32-gentoo. I think that mac-boot initializes
>   something which has same efect when you "turn on full performance"
>   on OSX.

  Solved, I think...

  I set following OF-values:

    boot-command   mac-boot
    boot-device    sd0:2,yaboot

  then I cold-booted machine and voila previous bzipping time
  was back, magical stunt?!

  I still suspect that boot-command value differs anything; 
  perhaps if boot is done from OF console with command
  "boot"/"mac-boot" then machine is set to lower speed. 
  On the other hand, if boot is done by cold-booting and not
  interfering boot sequence in any way then machine's processing
  speed should be ok I think. Have to check that...


> 
> > 
> > The only thing I see on a G5 is /proc/cpuinfo, which displays:
> > 
> > pvdabeel@Dual-G5 proc $ cat cpuinfo
> > processor       : 0
> > cpu             : PPC970, altivec supported
> > clock           : 1800MHz
> > revision        : 2.2 (pvr 0039 0202)
> > bogomips        : 1200.12
> > 
> > processor       : 1
> > cpu             : PPC970, altivec supported
> > clock           : 1800MHz
> > revision        : 2.2 (pvr 0039 0202)
> > bogomips        : 1200.12
> > 
> > total bogomips  : 2400.25
> > machine         : PowerMac7,2
> > motherboard     : PowerMac7,2 MacRISC4 Power Macintosh
> > detected as     : 336 (PowerMac G5)
> > pmac flags      : 00000000
> > L2 cache        : 512K unified
> > memory          : 0MB
> > pmac-generation : NewWorld

 Unfare! I dont have those bogomips values...  ;)

    # cat /proc/cpuinfo 
    processor       : 0
    cpu             : PPC970, altivec supported
    clock           : 2000.000000MHz
    revision        : 2.2

    processor       : 1
    cpu             : PPC970, altivec supported
    clock           : 2000.000000MHz
    revision        : 2.2

    timebase        : 33333333
    machine         : PowerMac7,2
    motherboard     : PowerMac7,2 MacRISC4 Power Macintosh
    detected as     : 336 (PowerMac G5)
    pmac flags      : 00000000
    pmac-generation : NewWorld

> 
> 

-- 

IsoH



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Updated Jun 17, 2009

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