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LostControl
l33t
Joined: 02 Mar 2004
Posts: 885
Location: La Glane, Suisse
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 Posted: Tue Mar 23, 2004 9:19 pm Post subject: [ACPI] Processor promotion/demotion (C1, C2, C3) |
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Hi,
I have some small questions related to unit "processor" acpi.
1/ Is it normal that when I do to turn a soft that loads the CPU (nbench for example), the processor passes the biggest party of his time in the state C2? Not should it be in the state C1? Or then is it in the state C0 (cf. doc ACPI)?
2/ When I connect my mouse USB, "bus master activity" remains constantly to "ffffffff" but as soon as I disconnect it, the values begin at last to vary and the processeur can pass in C3. Normal behavior?
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Earthwings
Bodhisattva
Joined: 14 Apr 2003
Posts: 7753
Location: Germany
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| Posted: Tue Mar 23, 2004 10:00 pm Post subject: Re: [ACPI] Processor promotion/demotion (C1, C2, C3) |
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| LostControl wrote: |
1/ Is it normal that when I do to turn a soft that loads the CPU (nbench for example), the processor passes the biggest party of his time in the state C2? Not should it be in the state C1? Or then is it in the state C0 (cf. doc ACPI)?
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It will be in fact in C0. The "*"-marked line you see and "active state" from "cat /proc/acpi/processor/CPU/state" do not necessarily tell you which state is currently active, but which one will be active when the system is idle. Quoting the docs:
"*: this is the currently active idling state. This does not mean the system is currently idle. It only reflects which processor sleep state is called when the system becomes idle."
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2/ When I connect my mouse USB, "bus master activity" remains constantly to "ffffffff" but as soon as I disconnect it, the values begin at last to vary and the processeur can pass in C3. Normal behavior?
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Yes, that's normal behaviour. Normal until "USB selective suspend" gets implemented in the kernel (correct me if it already is, I searched for it but found nothing). The problem is that with your USB mouse plugged in there's a periodically poll which prevents your processor from going into C3. USB selective suspend would block that poll when a device is not active thus allowing the C3 state. Hopefully it gets implemented in the near future. |
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LostControl
l33t
Joined: 02 Mar 2004
Posts: 885
Location: La Glane, Suisse
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| Posted: Tue Mar 23, 2004 10:26 pm Post subject: |
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Many thanks for your reply 
I understand better what happens !!! I still get problems ("Loosing too many ticks") using processor.ko and acpi.ko for speedstepping with my 2.6.4-rc1. But using speedstep_centrino.ko works great so just wait on new kernel to try again...
But this is an other story...
Last edited by LostControl on Wed Mar 24, 2004 6:58 pm; edited 1 time in total |
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Earthwings
Bodhisattva
Joined: 14 Apr 2003
Posts: 7753
Location: Germany
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| Posted: Tue Mar 23, 2004 11:50 pm Post subject: |
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Maybe this helps, too...
| make menuconfig wrote: |
CONFIG_X86_PM_TIMER: ?
? ?
? The Power Management Timer is available on all ACPI-capable, ?
? in most cases even if ACPI is unusable or blacklisted. ?
? ?
? This timing source is not affected by powermanagement features ?
? like aggressive processor idling, throttling, frequency and/or ?
? voltage scaling, unlike the commonly used Time Stamp Counter ?
? (TSC) timing source. ?
? ?
? So, if you see messages like 'Losing too many ticks!' in the ?
? kernel logs, and/or you are using a this on a notebook which ?
? does not yet have an HPET, you should say "Y" here.
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That's "Power Management Timer Support" in the ACPI section. |
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LostControl
l33t
Joined: 02 Mar 2004
Posts: 885
Location: La Glane, Suisse
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| Posted: Wed Mar 24, 2004 12:15 pm Post subject: |
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I already try this but I still have a wrong cpu speed reported in /proc/cpuinfo. I try a new version of ipw2100 and to some tests with and without processor.ko.
A+ |
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