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IsoH wrote: |
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>On Thu, 10 Jun 2004, Pieter Van den Abeele wrote: |
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Greetings, |
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While I won't say this is your particular situation but for instance if |
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you boot up into OF and then say specify boot into yaboot, you'll |
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actually run at 1/2 speed. This is a "fee-chur". Effectively the box |
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powers up, decides that no one is programming the fans correctly and |
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takes measures. |
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It's specific to apple hardware and no other ppc64 box does that. |
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Anyway, normal boots from ybin -> yaboot -> linux should be fine. |
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If not, certainly I and benh would be very very interested! |
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Regards, |
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Tom |
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>>is /proc/cpufreq useable on a G5? |
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>> |
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>> |
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> |
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> Perhaps not, but all I now is that missing performance... |
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> |
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> I have very simple test for that; I first boot with mac-boot+ppc64-livecd |
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> and bzipping (bzip -9) test file, which takes 8.8 seconds to compress. |
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> Then I boot with yaboot from /dev/sda and repeating same bzipping and |
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> now it takes about 12.6 seconds. |
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> btw. with ppc32 same test takes about 7.1 seconds. |
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> |
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> I found out this phenomenon couple months ago when I played |
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> with OSX and ppc32-gentoo. I think that mac-boot initializes |
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> something which has same efect when you "turn on full performance" |
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> on OSX. |
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> |
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> |
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> |
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>>The only thing I see on a G5 is /proc/cpuinfo, which displays: |
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>> |
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>>pvdabeel@Dual-G5 proc $ cat cpuinfo |
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>>processor : 0 |
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>>cpu : PPC970, altivec supported |
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>>clock : 1800MHz |
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>>revision : 2.2 (pvr 0039 0202) |
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>>bogomips : 1200.12 |
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>> |
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>>processor : 1 |
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>>cpu : PPC970, altivec supported |
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>>clock : 1800MHz |
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>>revision : 2.2 (pvr 0039 0202) |
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>>bogomips : 1200.12 |
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>> |
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>>total bogomips : 2400.25 |
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>>machine : PowerMac7,2 |
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>>motherboard : PowerMac7,2 MacRISC4 Power Macintosh |
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>>detected as : 336 (PowerMac G5) |
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>>pmac flags : 00000000 |
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>>L2 cache : 512K unified |
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>>memory : 0MB |
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>>pmac-generation : NewWorld |
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>> |
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>>On 10 Jun 2004, at 21:30, IsoH wrote: |
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>> |
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>> |
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>> |
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>>> I've noticed that there is no /proc/cpufreq anymore |
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>>> (this is 2.6.7-rc2), so how do I suppose to give a command: |
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>>> echo "x:yyyy:zzzz:performance" > /proc/cpufreq |
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>>> |
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>>> ??? |
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>>> |
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>>> It is obvious that about 25-35% performance is missing; |
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>>> it is possible to gain this back if I boot by mac-boot & livecd, |
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>>> but I want to boot from /dev/sda now with full performance... |
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>>> |
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>>> |
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>>>IsoH |
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>>> |
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>>> |
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>>> |
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> |
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> |
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> |
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-- |
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