Messages in this thread | | | Subject | why use ACPI (Re: 2.6.10-rc2 doesn't boot (if no floppy device)) | From | Len Brown <> | Date | 22 Nov 2004 20:07:36 -0500 |
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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.
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.
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.
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.
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.
cheers, -Len
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