Gentoo Archives: gentoo-ppc-dev

From: IsoH <jd@××××××.fi>
To: Pieter Van den Abeele <pvdabeel@g.o>
Cc: gentoo-ppc-user@l.g.o, gentoo-ppc-dev@l.g.o
Subject: Re: [gentoo-ppc-dev] G5 & missing performance
Date: Fri, 11 Jun 2004 06:39:04
Message-Id: Pine.LNX.4.21.0406110923360.21411-100000@alphatux2.ts.ray.fi
In Reply to: Re: [gentoo-ppc-dev] G5 & missing performance by Pieter Van den Abeele
1 On Thu, 10 Jun 2004, Pieter Van den Abeele wrote:
2
3 > is /proc/cpufreq useable on a G5?
4
5 Perhaps not, but all I now is that missing performance...
6
7 I have very simple test for that; I first boot with mac-boot+ppc64-livecd
8 and bzipping (bzip -9) test file, which takes 8.8 seconds to compress.
9 Then I boot with yaboot from /dev/sda and repeating same bzipping and
10 now it takes about 12.6 seconds.
11 btw. with ppc32 same test takes about 7.1 seconds.
12
13 I found out this phenomenon couple months ago when I played
14 with OSX and ppc32-gentoo. I think that mac-boot initializes
15 something which has same efect when you "turn on full performance"
16 on OSX.
17
18 >
19 > The only thing I see on a G5 is /proc/cpuinfo, which displays:
20 >
21 > pvdabeel@Dual-G5 proc $ cat cpuinfo
22 > processor : 0
23 > cpu : PPC970, altivec supported
24 > clock : 1800MHz
25 > revision : 2.2 (pvr 0039 0202)
26 > bogomips : 1200.12
27 >
28 > processor : 1
29 > cpu : PPC970, altivec supported
30 > clock : 1800MHz
31 > revision : 2.2 (pvr 0039 0202)
32 > bogomips : 1200.12
33 >
34 > total bogomips : 2400.25
35 > machine : PowerMac7,2
36 > motherboard : PowerMac7,2 MacRISC4 Power Macintosh
37 > detected as : 336 (PowerMac G5)
38 > pmac flags : 00000000
39 > L2 cache : 512K unified
40 > memory : 0MB
41 > pmac-generation : NewWorld
42 >
43 > On 10 Jun 2004, at 21:30, IsoH wrote:
44 >
45 > >
46 > > I've noticed that there is no /proc/cpufreq anymore
47 > > (this is 2.6.7-rc2), so how do I suppose to give a command:
48 > > echo "x:yyyy:zzzz:performance" > /proc/cpufreq
49 > >
50 > > ???
51 > >
52 > > It is obvious that about 25-35% performance is missing;
53 > > it is possible to gain this back if I boot by mac-boot & livecd,
54 > > but I want to boot from /dev/sda now with full performance...
55 > >
56 > >
57 > > IsoH
58 > >
59 >
60
61 --
62
63 IsoH
64
65
66
67 --
68 gentoo-ppc-dev@g.o mailing list

Replies

Subject Author
Re: [gentoo-ppc-dev] G5 & missing performance Luca Barbato <lu_zero@g.o>
Re: [gentoo-ppc-dev] G5 & missing performance IsoH <jd@××××××.fi>
Re: [gentoo-ppc-dev] G5 & missing performance Tom Gall <tom_gall@×××.com>