Re: why use ACPI (Re: 2.6.10-rc2 doesn't boot (if no floppy device))
From: Adrian Bunk (bunk_at_stusta.de)
Date: 11/23/04
- Previous message: Stuart Macdonald: "RE: netfilter query"
- In reply to: Len Brown: "why use ACPI (Re: 2.6.10-rc2 doesn't boot (if no floppy device))"
- Next in thread: Len Brown: "Re: why use ACPI (Re: 2.6.10-rc2 doesn't boot (if no floppy device))"
- Reply: Len Brown: "Re: why use ACPI (Re: 2.6.10-rc2 doesn't boot (if no floppy device))"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Date: Tue, 23 Nov 2004 02:37:20 +0100 To: Len Brown <len.brown@intel.com>
On Mon, Nov 22, 2004 at 08:07:36PM -0500, Len Brown wrote:
> On Mon, 2004-11-22 at 19:46, Adrian Bunk wrote:
>
> > Not needed "pressing the power button when you halt the system" is the
> > "killer application" for using ACPI for me...
>
> Yes, thats certainly one that people notice right away. Laptops have
> had soft poweroff with APM for a while, but desktops and servers never
> adopted APM, so soft-power-off is generally a new feature with ACPI for
> them.
That's wrong.
My old desktop computer (with a VIA MVP3 chipset and an AMD K6 cpu)
I bought in 1998 did power off fine under Linux using APM.
> Enabling IOAPIC is one that a lot of people like, because it results in
> less interrupt sharing and better performance than PIC mode. But if you
> don't load your system much you may not notice any difference.
I saw
kernel: APIC error on CPU0: 00(02)
...
kernel: APIC error on CPU0: 02(02)
on my computer and decided disabling APIC was the easiest way to solve
them...
> Next people tend to notice fan speed, because they can hear it.
> If you load processor and thermal, you'll probably see some
> /proc/acpi/thermal/thermal_zone/*/temperature and you'll
> probably find that it stays lower if you keep processor
> loaded versus when you do not.
/proc/acpi/thermal/thermal_zone is empty on my computer.
> This is usually because of power-saving c-csates in idle,
> which you can observe in /proc/acpi/processor/*/power
> and the higher the C-state, the more power you save.
active state: C1
default state: C1
bus master activity: 00000000
states:
*C1: promotion[--] demotion[--] latency[000] usage[00000000]
C2: <not supported>
C3: <not supported>
> Also, CPUFREQ usually often on ACPI, and that can save
> power even when the system is not idle, and this results
> in lower temperatures and hopefully slower fan speeds.
My computer has a desktop Athlon...
> cheers,
> -Len
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
- Previous message: Stuart Macdonald: "RE: netfilter query"
- In reply to: Len Brown: "why use ACPI (Re: 2.6.10-rc2 doesn't boot (if no floppy device))"
- Next in thread: Len Brown: "Re: why use ACPI (Re: 2.6.10-rc2 doesn't boot (if no floppy device))"
- Reply: Len Brown: "Re: why use ACPI (Re: 2.6.10-rc2 doesn't boot (if no floppy device))"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Relevant Pages
|
