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Old 08-17-2004, 10:25 AM   #1
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Registered: Apr 2004
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Exclamation Fedora doesnt recognize correct cpu speed

I'm running Fedora Core2 on an Acer Aspire 1315 LM
which has an AMD Athlon(tm) XP 2500 cpu

but when i look for my cpuspeed
with 'cat /proc/cpuinfo' this is what it says:

processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 10
model name : AMD Athlon(tm) XP 2500+
stepping : 0
cpu MHz : 796.124
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
bogomips : 1558.82

my cpu MHz speed is not a third as it shoud be!!

any idea to change this?

i heard of a tool name cpufreq but i don't now if it's appropriate
shall i recompile the kernel myself? is there a config-file for the newest kernel?
though i installed the new kernel with up2date i've got no clue if i already have
the src and the config-file..

or is there an easyer way (what i hope is the case)?

thx, would be really great if someone comes up with any help

Old 08-17-2004, 12:46 PM   #2
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Location: Finland
Distribution: Debian, Fedora, FreeBSD, OpenBSD
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Re: Fedora doesnt recognize correct cpu speed


Acer Aspire 1315 LM is notebook / laptop right? so there is the answer!
Notebooks & Laptops adjust processor speed all the time to save batteries and avoid heating etc, You can try run some heavy progs and same time look the what is thats moments processor MHz etc.

Best regards
Pekka "Teukka"

Last edited by Teukka; 08-17-2004 at 12:47 PM.
Old 08-17-2004, 01:05 PM   #3
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Registered: Feb 2003
Location: N'rn WI -- USA
Distribution: Kubuntu 8.04, ClarkConnect 4
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I have FC3-T1 on a Compaq laptop, and had the same concern first time I saw it.

If you want, you can run "kill -USR1 $(pidof cpuspeed)" as root. I know, it looks like you are killing cpuspeed, but you aren't. It sends USR1 signal to cpuspeed... Which is a signal to tell cpuspeed to run the processor at full speed. cpuspeed controls the processor so that it slow down when it's not as active. When load increases, cpuspeed is s'posed to bump the processor up. This helps keep the heat down, and uses less power.
Old 08-17-2004, 03:19 PM   #4
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you're right! thx, i did'nt know that. i run some programs and the cpu-speed did increase!
but when i'm running some video files with mplayer it is reporting to me, that
my system is to slow to play the desired file... is there a way manipulation it like
ranger_nemo suggested?


i can't apply the same command. when i'm trying to run it i get following

[root@12kingdoms root]# kill -USR1 $(pidof cpuspeed)
bash: pidof: command not found
kill: usage: kill [-s sigspec | -n signum | -sigspec] [pid | job]... or kill -l [sigspec]
[root@12kingdoms root]# kill -USR1 cpuspeed
bash: kill: cpuspeed: no such pid

any idea what to change? i tried to yum install cpuspeed and apt-get install cpuspeed,
but nothing worked yet...

thx 2 u both for reply's, they gave me hope

Old 08-17-2004, 04:17 PM   #5
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Location: N'rn WI -- USA
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You can get the pid of cpuspeed with "ps -e | grep cpuspeed". Then run "kill -USR1 #", replacing the # with the pid listed from the first command.

You prob'ly used "su" to run the original command I suggested. If you did, you would need to change it to "kill -USR1 $(/sbin/pidof cpuspeed)". With "su", you only get the permissions of root, not the path. If you would use "su -" instead, then it would be like you are logging-in as root, and gain the path, too. Then, the original "kill -USR1 $(pidof cpuspeed)" would work.

There's also a -USR2 signal. "man cpuspeed" will give you a lot more info.
Old 08-17-2004, 05:03 PM   #6
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aaaaaaaaahhh pid = process id.

what a shame! sure thing.

now it works all fine. i already made 2 scripts to speedup und to lower my speed.
thx a lot. u brought light into my darkness or shall i say speed to my cpu?



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