Re: acpi_thorttle and cpufreq/ichss questions

[Srikanth, Throvagunta]

Harry,
ACPI throttling is closely system-dependent. FreeBSD does its best at
arriving at the right values. I recommend you should look into sources
for complete answers. By the way, you have forgot to mention the
version [like 6.0] of FreeBSD you are actually running on your laptop.
That will be useful information to give for an answer.
--Srikanth

--
Date:   Wed, 28 Sep 2005 14:49:32 +0200
From:   Emanuel Strobl <[EMAIL PROTECTED]>
To:   freebsd-questions@freebsd.org
Subject:   acpi_thorttle and cpufreq/ichss questions

Hello,

my laptop (PIII LV) runs fine with cpufreq and ichss:

dev.ichss.0.%desc: SpeedStep ICH
dev.ichss.0.%driver: ichss
dev.ichss.0.%parent: cpu0
dev.ichss.0.freq_settings: 794/-1 497/-1


If I understand the output correctly i have two SpeedSteps, the full 800MHz==20
(with higher voltage) and 500MHz.

But now I also have acpi_throttle (if I don't disable it=20
in /boot/loader.conf):

dev.acpi_throttle.0.%desc: ACPI CPU Throttling
dev.acpi_throttle.0.%driver: acpi_throttle
dev.acpi_throttle.0.%parent: cpu0
dev.acpi_throttle.0.freq_settings: 1/-1 8750/-1 7500/-1 6250/-1 5000/-1==20
3750/-1 2500/-1 1250/-1

What do these values tell me? I think that are divisors, but how can I see==20
which one is used? I remember that some time back I saw at boot time some=20
information about "throttle has xx steps, currently using 100%" or=20
something like that.
Can I constrain the divisors, lets say I want to have only 1, 7500 and==20
5000? (I know I can limit the lowest frequency cpufreq may use with=20
"debug.cpufreq.lowest=3D310" but then I don't know if it throttles the=20
800MHz mode (thus using high core voltage) or if it throttles the power=20
saving 500MHz mode)

And what does this tell me:

hw.acpi.cpu.cx_supported: C1/0 C2/10 C3/85
hw.acpi.cpu.cx_lowest: C1
hw.acpi.cpu.cx_usage: 100.00% 0.00% 0.00%

Thanks in advance,

=2DHarry
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Re: How to diagnose crashes?

[Srikanth, Throvagunta]

Chris,

The 5.3 have this problem. I think it has something to do with ACPI.
Either go back to the 5.2 or pick the latest. You say the system
reboots itself from time to time. Is it a panic you see before the
reboot?

There must be an option to turn on somewhere asking them to write to
disk the contents of the physical memory. You can, then, run gdb on
the dumped core. I think I have seen someone do that on NetBSD.

Srikanth
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My FreeBSD 5.3-RELEASE box seems to be spontaneously restarting from
time to time.

I have not yet contacted the colo facility to determine if it's a power
issue, but wonder if anyone can help me out in how to diagnose whether
or not it's a server crash and not a power problem.

Where should I look for tips / hints that might help me determine the
cause of a crash that forced a reboot?

Thanks,
Chris
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