CPU speed
in [Suse]
|
From: Darklight on 4 Dec 2009 05:06 houghi wrote: > I noticed that my CPU is now not running at full speed. Where can I set > the speed to full? It is running at 2GHz while the mobo clearly states > in the bios that it is 2.83. > > So something slows it down. Probably rightfully to save energy. It is > stated as "ondemand" now. > > However I have some small issues with watching tv with mplayer where the > first 15-20 seconds are very slugish, while the sound comes out right > away. Movies give no problem at all. > > This leads to extreme out of sync sound and music (16-20 seconds). I > tried many possible things, but would like to exclude the CPU issue > before I go any further. > > houghi kpowersave
From: Ulick Magee on 4 Dec 2009 06:45 houghi wrote: > Darklight wrote: >> kpowersave > > Anything else? The above is not installed. I could install it obviously, > but something more generic would be nice. Houghi, is your google/scroogle broken? :-P First result for: configure cpu speed linux gives cpufreq. First result for cpufreq is: http://www.kernel.org/pub/linux/utils/kernel/cpufreq/cpufreq.html which links to: http://www.kernel.org/pub/linux/utils/kernel/cpufreq/cpufrequtils.html cpufrequtils is in the main repo. HTH, HAND and remember, GIYF :-; -- Ulick Magee Free software and free formats for free information for free people. Open Office for Windows/OSX/Linux: http://www.openoffice.org openSUSE Linux: http://en.opensuse.org
From: baron on 4 Dec 2009 09:19 houghi Inscribed thus: > Ulick Magee wrote: >> houghi wrote: >>> Darklight wrote: >>>> kpowersave >>> >>> Anything else? The above is not installed. I could install it >>> obviously, but something more generic would be nice. >> >> Houghi, is your google/scroogle broken? :-P > > No, it is not. I just am unable to find what program is already > installed on my machine that already does the changes and either > disable or reconfigure it. > >> First result for: >> >> configure cpu speed linux >> >> gives cpufreq. First result for cpufreq is: > > cpufreq is not installed > >> http://www.kernel.org/pub/linux/utils/kernel/cpufreq/cpufreq.html >> >> which links to: >> >> http://www.kernel.org/pub/linux/utils/kernel/cpufreq/cpufrequtils.html >> >> cpufrequtils is in the main repo. > > Also not installed, just like kpowersave. ;-) > >> >> HTH, HAND and remember, GIYF :-; > > Ah, so the best alternative not to install something is to install > something? And yet something must be already installed on my machine > that let it go from 2.83 to 2.00. Or something must have set it to > 'ondemand'. I would like to have it as performance. > > So some setting somewhere does some changes and I would like to know > how and how I can change it. > > houghi Hi Houghi, Its quite likely that the CPU speed is actually 2000 for a 2.8Ghz cpu. I'm guessing that you have an intel cpu. -- Best Regards: Baron.
From: Ulick Magee on 4 Dec 2009 10:08 houghi wrote: > > cpufreq is not installed It and cpufrequtils are not installed on my system either (although kpowersave is, the system has KDE3.5 and 4.something installed -it's 11.1) > Ah, so the best alternative not to install something is to install > something? Presumably the reason you didn't want to install kpowersave was a metric fuckton of KDE dependencies on a machine that doesn't have or need KDE (knowing your desktop environment preferences :) ) At least cpufrequtils would let you experiment and see if you could get the frequency any higher (or maybe an error message that would be helpful.) > And yet something must be already installed on my machine > that let it go from 2.83 to 2.00. Or something must have set it to > 'ondemand'. I would like to have it as performance. What does dmesg say about CPU speed, and ACPI and APM? Have you tried booting with noacpi or noapm option? Is there any other OS on the machine? What speed does it report? Have you tried booting a live CD of another linux to see what it reports? > So some setting somewhere does some changes and I would like to know how > and how I can change it. What does cat /proc/cpuinfo show? Here's mine : # cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU T7400 @ 2.16GHz stepping : 6 cpu MHz : 2167.000 cache size : 4096 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm bogomips : 4322.48 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 [*snip* same as above] That's a laptop on AC power, on battery the CPU MHz value goes down to 1000MHz (as set in kpowersave) but the model name still shows the CPU is capable of 2.16GHz. It would be interesting to find out how and why your CPU speed is being throttled. I wonder is it possible the CPU is doing it itself to manage power/heat? The latest Intels can overclock one or more cores automatically when under heavy load, provided the heat dissipation is within limits. Is there any change in the reported MHz value if you put the system under very heavy load? -- Ulick Magee Free software and free formats for free information for free people. Open Office for Windows/OSX/Linux: http://www.openoffice.org openSUSE Linux: http://en.opensuse.org
From: Ulick Magee on 4 Dec 2009 10:14
baron wrote: > Its quite likely that the CPU speed is actually 2000 for a 2.8Ghz cpu. > I'm guessing that you have an intel cpu. AMD used to name CPUs as something like 2500+ where they claimed it was equivalent to an Intel running at 2500MHz, but the actual clock speed of the AMD would be something like 2000. Calling a CPU 2500+ or whatever is OK as it's a marketing number not a clock speed. Saying it was 2.5GHz when it was only running at 2.0GHz would be misleading. Both AMD and Intel use pretty much meaningless numbers for CPUs now, not clock speeds, there is a lot more than clock speed that determines actual performance. -- Ulick Magee Free software and free formats for free information for free people. Open Office for Windows/OSX/Linux: http://www.openoffice.org openSUSE Linux: http://en.opensuse.org |