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To: IsoH <jd@...>
From: Tom Gall <tom_gall@...>
Subject: Re: G5 & missing performance
Date: Fri, 11 Jun 2004 04:38:24 -0500
IsoH wrote:

>On Thu, 10 Jun 2004, Pieter Van den Abeele wrote:
>  
>
Greetings,
While I won't say this is your particular situation but for instance if 
you boot up into OF and then say specify boot into yaboot, you'll 
actually run at 1/2 speed.  This is a "fee-chur".  Effectively the box 
powers up, decides that no one is programming the fans correctly and 
takes measures.

It's specific to apple hardware and no other ppc64 box does that. 
Anyway, normal boots from ybin -> yaboot -> linux  should be fine.

If not, certainly I and benh would be very very interested!

Regards,

Tom

>>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.
>
>  
>
>>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
>>
>>On 10 Jun 2004, at 21:30, IsoH wrote:
>>
>>    
>>
>>> I've noticed that there is no /proc/cpufreq anymore
>>> (this is 2.6.7-rc2), so how do I suppose to give a command:
>>>    echo "x:yyyy:zzzz:performance" > /proc/cpufreq
>>>
>>> ???
>>>
>>> It is obvious that about 25-35% performance is missing;
>>> it is possible to gain this back if I boot by mac-boot & livecd,
>>> but I want to boot from /dev/sda now with full performance...
>>>
>>>
>>>IsoH
>>>
>>>      
>>>
>
>  
>


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Updated Jun 17, 2009

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