Re: Multi-core CPU and powersaving

Thad Floryan wrote:

You might need some additional packages from a repository; depends on the
distro.


Slackware. If its not in there its probally not that difficult to add.

Google "linux cpu speed toggling" for more info.

What a cheat, when I googled "linux cpu speed toggling" the third entry was
your very post suggesting I google. No more rentrant google searches
please... ;-)

Hmm, powernowd looks interesting, but maintainer has dropped it in favour of
the kernel governor. I ought to read up on that.


Since you mentioned a 2.5GHz Athlon, my Fedora system is running with an
AMD Athlon X2 4850e. When busy, it's operating at 2.5GHz, and when idle
it's at 1GHz per the top panel's CPU Frequency Scaling Monitor (added to
the panel
by right-clicking on the panel and choosing the Monitor). The Monitor can
also be used to set a fixed speed; for the 4850e the speed choices are 1,
1.8, 2, 2.2, 2.4, and 2.5GHz.

Just contemplating whether to upgrade now. Up till about six months back
all was well. Have upgraded to 1GB ram but more and more I find the
machine is not as responsive as I would like. Its less responsive on
occasion than my 900MHz Celeron M powered eee. However, the eee does not
have to many daemons and otherthings running away quietly in the backgroud
where as this pc does. And all the stuff quietly running in the background
here is doing useful stuff.

I've found I can get a newer triple core with 6MB L3 for the same price as
an older quad core AND motherboard. Rather thinking that perhaps the more
cache on the dearer processor _might_ be better than the extra core. Plus
it is 95W versus 125W (I think). Plus someone indicated that on mobo they
managed to unlock the unused core!

Since I'm not a gamer, so I don't care about the latest and greatest
graphics cards and I don't intend to overclock I'm thinking that this x3
processor in a relatively inexpensive mobo would be a good combination.


That and it would be nice to virtualise at near native speed which everyone
bar me seems able to do.




Just sitting at a terminal window:

$ cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 107
model name : AMD Athlon(tm) Dual Core Processor 4850e
stepping : 2
cpu MHz : 1000.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
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 apic mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext
fxsr_opt rdtscp lm 3dnowext 3dnow pni cx16 lahf_lm
cmp_legacy svm extapic cr8_legacy 3dnowprefetch
bogomips : 2009.07
clflush size : 64
power management: ts fid vid ttp tm stc 100mhzsteps

processor : 1
[...]

Well, if comparing notes when I said athlon I meant ye old Athlon XP, 32
bit, single core. Confused, if counting bogomips my vetrnerable CPU pounds
yours into a pulp!

cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 10
model name : AMD Athlon(tm) XP 2500+
stepping : 0
cpu MHz : 1825.982
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 apic sep mtrr pge mca
cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow up
bogomips : 3651.96
clflush size : 32
power management: ts


--
http://www.petezilla.co.uk
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