Processor is almost never in C1 state
Hello,
I have a Toshiba Portege laptop with a 500 mhz pentium-3 mobile CPU. The processor is almost never is in the C1 state, and spends 99.9% of the time in the C2 state, even when doing heavy processing.
After a night of compiling KDE, and while running the "burnP6" program included in the "cpuburn 1.4" package, this is the output of /proc/acpi/processor/CPU0/power:
active state: C2
default state: C1
bus master activity: 00000000
states:
C1: promotion[C2] demotion[--] latency[000] usage[00009710]
*C2: promotion[--] demotion[C1] latency[001] usage[12232108]
C3: <not supported>As you can see, even though the processor is being maxed out by burnP6, it remains in the C2 state and doesn't really use the C1 state at all.
I don't mind having the CPU in this lower power/lower performance state most of the time... however I occassionally like to play DVDs on this laptop, and I need all the CPU power I can get when playing DVDs, or else I will get lots of dropped frames.
I am running kernel 2.6.10-rc2-mm4. I noticed that in the kernel parameters I can disable the C2 state altogether, but I'd rather not have to reboot whenever I play a DVD. Is there a way to tweak ACPI so that the processor spends more time in the C1 state, without giving up the C2 state entirely?
thanks for any help,
Jim Faulkner
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I have somewhat similar numbers (C1 is has a larger value, but is almost never used) on a Compaq Evo N620c.
I found, just by playing around, that by removing
USB modules, I can make my system go into C1 much
faster when doing CPU intensive operations.
See if that works for you.
-vlad
Quoted 27 lines · dogshu
Hello,
I have a Toshiba Portege laptop with a 500 mhz pentium-3 mobile CPU. The processor is almost never is in the C1 state, and spends 99.9% of the time in the C2 state, even when doing heavy processing.
After a night of compiling KDE, and while running the "burnP6" program included in the "cpuburn 1.4" package, this is the output of
/proc/acpi/processor/CPU0/power:active state: C2 default state: C1 bus master activity: 00000000 states: C1: promotion[C2] demotion[--] latency[000] usage[00009710] *C2: promotion[--] demotion[C1] latency[001] usage[12232108] C3: <not supported>As you can see, even though the processor is being maxed out by burnP6, it remains in the C2 state and doesn't really use the C1 state at all.
I don't mind having the CPU in this lower power/lower performance state most of the time... however I occassionally like to play DVDs on this laptop, and I need all the CPU power I can get when playing DVDs, or else I will get lots of dropped frames.
Quoted 8 lines
I am running kernel 2.6.10-rc2-mm4. I noticed that in the kernel parameters I can disable the C2 state altogether, but I'd rather not have to reboot whenever I play a DVD. Is there a way to tweak ACPI so that the processor spends more time in the C1 state, without giving up the C2 state entirely?
thanks for any help,
Jim Faulkner
-------------------------------------------------------
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Quoted 2 lines · Vlad Yasevich
I have somewhat similar numbers (C1 is has a larger value, but is almost never used) on a Compaq Evo N620c.cat power
active state: C3
default state: C1
bus master activity: 20040400
states:
C1: promotion[C2] demotion[--] latency[000] usage[01802320]
C2: promotion[C3] demotion[C1] latency[050] usage[03740741]
*C3: promotion[--] demotion[C2] latency[050] usage[03718525]Quoted 4 lines
I found, just by playing around, that by removing
USB modules, I can make my system go into C1 much
faster when doing CPU intensive operations.
USB is usually the problem.
Quoted 44 lines
See if that works for you.
-vlad
Quoted 27 lines · dogshu
Hello,
I have a Toshiba Portege laptop with a 500 mhz pentium-3 mobile CPU. The processor is almost never is in the C1 state, and spends 99.9% of the time in the C2 state, even when doing heavy processing.
After a night of compiling KDE, and while running the "burnP6" program included in the "cpuburn 1.4" package, this is the output of
/proc/acpi/processor/CPU0/power:active state: C2 default state: C1 bus master activity: 00000000 states: C1: promotion[C2] demotion[--] latency[000] usage[00009710] *C2: promotion[--] demotion[C1] latency[001] usage[12232108] C3: <not supported>As you can see, even though the processor is being maxed out by burnP6, it remains in the C2 state and doesn't really use the C1 state at all.
I don't mind having the CPU in this lower power/lower performance state most of the time... however I occassionally like to play DVDs on this laptop, and I need all the CPU power I can get when playing DVDs, or else I will get lots of dropped frames.
Quoted 8 lines
I am running kernel 2.6.10-rc2-mm4. I noticed that in the kernel parameters I can disable the C2 state altogether, but I'd rather not have to reboot whenever I play a DVD. Is there a way to tweak ACPI so that the processor spends more time in the C1 state, without giving up the C2 state entirely?
thanks for any help,
Jim Faulkner
Quoted 9 lines
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Ow Mun Heng
Gentoo/Linux on D600 1.4Ghz
Neuromancer 11:33:26 up 2:35, 7 users, 0.32, 0.37, 0.68
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Quoted 11 lines · dogshu
I have a Toshiba Portege laptop with a 500 mhz pentium-3 mobile CPU. The processor is almost never is in the C1 state, and spends 99.9% of the time in the C2 state, even when doing heavy processing.
C1: promotion[C2] demotion[--] latency[000] usage[00009710] *C2: promotion[--] demotion[C1] latency[001] usage[12232108] C3: <not supported>As you can see, even though the processor is being maxed out by burnP6, it remains in the C2 state and doesn't really use the C1 state at all.
The latency of C2 is very low, so there is no reason to use C1 very often or for a prolonged amount of time. If the Processor is doing "real work" it is in no C-state at all (you might think of it as "C0" :-) if i understand things correctly (please someone more knowledgeable correct me if i am wrong).
Signature · 9 lines
Stefan Seyfried ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/
What's the problem? Do you actually experience slowness, or do you want your CPU to go into C1 just for the sake of going into C1?
Also, if you maxed out your cpu with that program, then that means that the processor was too busy to go into any of the sleep modes; therefore, all the counters should have remained unchanged. If you want to keep your CPU from going into C1/C2, then open a terminal and run: nice bash -c 'while true; do false; done'
that will guarantee that the cpu will never go into sleep mode, while yielding to programs with higher priority.
Quoted 36 lines · dogshu
Hello,
I have a Toshiba Portege laptop with a 500 mhz pentium-3 mobile CPU. The processor is almost never is in the C1 state, and spends 99.9% of the time in the C2 state, even when doing heavy processing.
After a night of compiling KDE, and while running the "burnP6" program included in the "cpuburn 1.4" package, this is the output of
/proc/acpi/processor/CPU0/power:active state: C2 default state: C1 bus master activity: 00000000 states: C1: promotion[C2] demotion[--] latency[000] usage[00009710] *C2: promotion[--] demotion[C1] latency[001] usage[12232108] C3: <not supported>As you can see, even though the processor is being maxed out by burnP6, it remains in the C2 state and doesn't really use the C1 state at all.
I don't mind having the CPU in this lower power/lower performance state most of the time... however I occassionally like to play DVDs on this laptop, and I need all the CPU power I can get when playing DVDs, or else I will get lots of dropped frames.
I am running kernel 2.6.10-rc2-mm4. I noticed that in the kernel parameters I can disable the C2 state altogether, but I'd rather not have to reboot whenever I play a DVD. Is there a way to tweak ACPI so that the processor spends more time in the C1 state, without giving up the C2 state entirely?
thanks for any help,
Jim Faulkner
Quoted 8 lines
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Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/
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Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/