[PATCH] Documentation update about pal_halt_light

[PATCH] Documentation update about pal_halt_light

[Eric Piel]

[-- Attachment #1: Type: text/plain, Size: 271 bytes --]

Hello,

I had to hang around in the code to find this invaluable option 
"nohalt". Let's document it!

That's a trivial documentation update, please apply.

Eric Piel

--
Documentation update about pal_halt_light on IA-64

Signed-off-by: Eric Piel <eric.piel@lifl.fr>
--

[-- Attachment #2: parameter-nohalt-ia64.patch --]
[-- Type: text/x-patch, Size: 428 bytes --]

--- kernel-parameters.txt.bak	2005-03-09 15:39:10.348323818 +0100
+++ kernel-parameters.txt	2005-03-09 15:55:19.583141065 +0100
@@ -837,6 +837,9 @@
 			instruction doesn't work correctly and not to
 			use it.
 
+	nohalt		[IA-64] Tells the kernel not to use the power saving 
+			function PAL_HALT_LIGHT when idle.
+
 	noirqdebug	[IA-32] Disables the code which attempts to detect and
 			disable unhandled interrupt sources.
 

Re: [PATCH] Documentation update about pal_halt_light

[David Mosberger]

>>>>> On Wed, 09 Mar 2005 16:12:06 +0100, Eric Piel <Eric.Piel@lifl.fr> said:

  Eric> Hello, I had to hang around in the code to find this
  Eric> invaluable option "nohalt". Let's document it!

  Eric> That's a trivial documentation update, please apply.

Good catch.  I thought it was documented already.  Perhaps it got
lost.  In any case, I think it would be good to mention why someone
might want to turn it on.  Perhaps something along the lines of:

	"This increases power-consumption.  On the positive side, it
	 reduces interrupt wake-up latency, which may improve
	 performance in certain environments such as networked
	 servers."

  --david

  Eric> -- Documentation update about pal_halt_light on IA-64

  Eric> Signed-off-by: Eric Piel <eric.piel@lifl.fr> -- ---
  Eric> kernel-parameters.txt.bak 2005-03-09 15:39:10.348323818 +0100
  Eric> +++ kernel-parameters.txt 2005-03-09 15:55:19.583141065 +0100
  Eric> @@ -837,6 +837,9 @@ instruction doesn't work correctly and not
  Eric> to use it.
 
  Eric> + nohalt [IA-64] Tells the kernel not to use the power saving
  Eric> + function PAL_HALT_LIGHT when idle.  + noirqdebug [IA-32]
  Eric> Disables the code which attempts to detect and disable
  Eric> unhandled interrupt sources.
 

Re: [PATCH] Documentation update about pal_halt_light

[Eric Piel]

[-- Attachment #1: Type: text/plain, Size: 961 bytes --]

David Mosberger a écrit :
>>>>>>On Wed, 09 Mar 2005 16:12:06 +0100, Eric Piel <Eric.Piel@lifl.fr> said:
> 
> 
>   Eric> Hello, I had to hang around in the code to find this
>   Eric> invaluable option "nohalt". Let's document it!
> 
>   Eric> That's a trivial documentation update, please apply.
> 
> Good catch.  I thought it was documented already.  Perhaps it got
> lost.  In any case, I think it would be good to mention why someone
> might want to turn it on.  Perhaps something along the lines of:
> 
> 	"This increases power-consumption.  On the positive side, it
> 	 reduces interrupt wake-up latency, which may improve
> 	 performance in certain environments such as networked
> 	 servers."
> 
Yes, the more, the merrier! Here is a new patch with the additional 
information proposed by David (and a little bit from me).

please discard the previous patch and apply this one,
Eric

Signed-off-by: Eric Piel <eric.piel@lifl.fr>

[-- Attachment #2: parameter-nohalt-ia64.patch --]
[-- Type: text/x-patch, Size: 696 bytes --]

--- linux-2.6.11/Documentation/kernel-parameters.txt.bak	2005-03-09 15:39:10.348323818 +0100
+++ linux-2.6.11/Documentation/kernel-parameters.txt	2005-03-10 00:41:15.289029890 +0100
@@ -837,6 +837,13 @@
 			instruction doesn't work correctly and not to
 			use it.
 
+	nohalt		[IA-64] Tells the kernel not to use the power saving 
+			function PAL_HALT_LIGHT when idle. This increases 
+			power-consumption. On the positive side, it reduces
+			interrupt wake-up latency, which may improve performance
+			in certain environments such as networked servers or
+			real-time systems.
+
 	noirqdebug	[IA-32] Disables the code which attempts to detect and
 			disable unhandled interrupt sources.