From: Pavel Machek <pavel@ucw.cz>
To: Kenneth Chen <kenneth.w.chen@intel.com>
Cc: 'Andrew Morton' <akpm@osdl.org>,
linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org
Subject: Re: add lowpower_idle sysctl
Date: Wed, 24 Mar 2004 09:54:22 +0000 [thread overview]
Message-ID: <20040324095422.GA241@elf.ucw.cz> (raw)
In-Reply-To: <200403182159.i2ILxhF12208@unix-os.sc.intel.com>
Hi!
> Sounds good, Thanks for the suggestion. I just coded it up:
>
>
> diff -Nur linux-2.6.4/include/linux/cpu.h linux-2.6.4.halt/include/linux/cpu.h
> --- linux-2.6.4/include/linux/cpu.h 2004-03-10 18:55:23.000000000 -0800
> +++ linux-2.6.4.halt/include/linux/cpu.h 2004-03-18 13:47:43.000000000 -0800
> @@ -52,6 +52,12 @@
>
> #endif /* CONFIG_SMP */
> extern struct sysdev_class cpu_sysdev_class;
> +extern int idle_mode;
> +
> +#define IDLE_NOOP 0
> +#define IDLE_HALT 1
> +#define IDLE_POLL 2
> +#define IDLE_ACPI 3
>
How is idle_noop different from idle_poll?
idle_halt is equivalent to idle_acpi_C1. But acpi supports also C2
(deeper sleep), and C3 (sleep without coherent caches) and newer
machines support even more. You might want to talk to Len Brown.
[And yes, limiting to C2 (for example) *is* usefull; some machines
(nforce2 iirc) have bugs, and die if you do C3 at wrong time].
Pavel
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
WARNING: multiple messages have this Message-ID (diff)
From: Pavel Machek <pavel@ucw.cz>
To: Kenneth Chen <kenneth.w.chen@intel.com>
Cc: "'Andrew Morton'" <akpm@osdl.org>,
linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org
Subject: Re: add lowpower_idle sysctl
Date: Wed, 24 Mar 2004 10:54:22 +0100 [thread overview]
Message-ID: <20040324095422.GA241@elf.ucw.cz> (raw)
In-Reply-To: <200403182159.i2ILxhF12208@unix-os.sc.intel.com>
Hi!
> Sounds good, Thanks for the suggestion. I just coded it up:
>
>
> diff -Nur linux-2.6.4/include/linux/cpu.h linux-2.6.4.halt/include/linux/cpu.h
> --- linux-2.6.4/include/linux/cpu.h 2004-03-10 18:55:23.000000000 -0800
> +++ linux-2.6.4.halt/include/linux/cpu.h 2004-03-18 13:47:43.000000000 -0800
> @@ -52,6 +52,12 @@
>
> #endif /* CONFIG_SMP */
> extern struct sysdev_class cpu_sysdev_class;
> +extern int idle_mode;
> +
> +#define IDLE_NOOP 0
> +#define IDLE_HALT 1
> +#define IDLE_POLL 2
> +#define IDLE_ACPI 3
>
How is idle_noop different from idle_poll?
idle_halt is equivalent to idle_acpi_C1. But acpi supports also C2
(deeper sleep), and C3 (sleep without coherent caches) and newer
machines support even more. You might want to talk to Len Brown.
[And yes, limiting to C2 (for example) *is* usefull; some machines
(nforce2 iirc) have bugs, and die if you do C3 at wrong time].
Pavel
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
next prev parent reply other threads:[~2004-03-24 9:54 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-18 0:31 add lowpower_idle sysctl Kenneth Chen
2004-03-18 0:31 ` Kenneth Chen
2004-03-18 1:04 ` Andrew Morton
2004-03-18 1:04 ` Andrew Morton
2004-03-18 9:42 ` Pasi Savolainen
2004-03-18 3:18 ` Kenneth Chen
2004-03-18 3:18 ` Kenneth Chen
2004-03-18 3:28 ` Andrew Morton
2004-03-18 3:28 ` Andrew Morton
2004-03-18 3:40 ` Zwane Mwaikambo
2004-03-18 3:40 ` Zwane Mwaikambo
2004-03-18 9:05 ` Dominik Brodowski
2004-03-18 9:05 ` Dominik Brodowski
2004-03-18 18:29 ` Kenneth Chen
2004-03-18 18:29 ` Kenneth Chen
2004-03-18 18:29 ` Kenneth Chen
2004-03-18 22:59 ` Todd Poynor
2004-03-18 22:59 ` Todd Poynor
2004-03-19 0:09 ` Andrew Morton
2004-03-19 0:09 ` Andrew Morton
2004-03-19 0:09 ` Andrew Morton
2004-03-19 0:43 ` Zwane Mwaikambo
2004-03-19 0:43 ` Zwane Mwaikambo
2004-03-25 19:20 ` Chen, Kenneth W
2004-03-25 19:20 ` Chen, Kenneth W
2004-03-25 19:20 ` Chen, Kenneth W
2004-03-18 21:59 ` Kenneth Chen
2004-03-18 21:59 ` Kenneth Chen
2004-03-18 22:35 ` Andrew Morton
2004-03-18 22:35 ` Andrew Morton
2004-03-24 9:54 ` Pavel Machek [this message]
2004-03-24 9:54 ` Pavel Machek
2004-03-23 9:56 ` Pavel Machek
2004-03-23 9:56 ` Pavel Machek
2004-03-25 19:04 ` Chen, Kenneth W
2004-03-25 19:04 ` Chen, Kenneth W
-- strict thread matches above, loose matches on Subject: below --
2004-03-18 7:49 Ross Dickson
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