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adsmith
Veteran
Joined: 26 Sep 2004
Posts: 1386
Location: NC, USA
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 Posted: Wed Jul 20, 2005 1:59 am Post subject: Athlon-XP (not mobile) shows throttling states. how to use? |
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I was playing with ACPI on my dekstop (Athlon-XP 2000+ (pre-barton core, I think), Via KD-400 chipset), and I see this:
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[root@tock:/proc/acpi/processor/CPU0]$ ls . | while read a; do echo -e "\n$a\n" && cat $a; done
info
processor id: 0
acpi id: 0
bus mastering control: no
power management: yes
throttling control: yes
limit interface: yes
limit
active limit: P0:T0
user limit: P0:T0
thermal limit: P0:T0
power
active state: C2
max_cstate: C8
bus master activity: 00000000
states:
C1: type[C1] promotion[C2] demotion[--] latency[000] usage[05312980]
*C2: type[C2] promotion[--] demotion[C1] latency[090] usage[26722720]
throttling
state count: 2
active state: T0
states:
*T0: 00%
T1: 50%
[root@tock:/proc/acpi/processor/CPU0]$
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I was under the impression that only mobile processors or the latest generation (AMD64, etc) provided throttling, so I never really looked into it.... is there a way I can use the T-states here?
It appears to jump happily between C1 and C2, and I can force them with echo >, but I can't seem to change the T-state. Ideas? |
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DZello
n00b
Joined: 09 Feb 2003
Posts: 46
Location: Québec, Canada
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| Posted: Wed Jul 20, 2005 2:19 am Post subject: |
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It is not a throttling function. Theses states add latency time to the processing of interrupt request to reduce power consumption.
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Kernel: 2.6.19-Beyond2
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Kernel & Hardware
