From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Piel Date: Wed, 09 Mar 2005 23:48:58 +0000 Subject: Re: [PATCH] Documentation update about pal_halt_light Message-Id: <422F8B6A.30103@lifl.fr> MIME-Version: 1 Content-Type: multipart/mixed; boundary="------------050507040608080501030503" List-Id: References: <422F1246.80008@lifl.fr> In-Reply-To: <422F1246.80008@lifl.fr> To: linux-ia64@vger.kernel.org This is a multi-part message in MIME format. --------------050507040608080501030503 Content-Type: text/plain; charset="iso-8859-1"; format="flowed" Content-Transfer-Encoding: quoted-printable David Mosberger a =E9crit : >>>>>>On Wed, 09 Mar 2005 16:12:06 +0100, Eric Piel sai= d: >=20 >=20 > Eric> Hello, I had to hang around in the code to find this > Eric> invaluable option "nohalt". Let's document it! >=20 > Eric> That's a trivial documentation update, please apply. >=20 > 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: >=20 > "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." >=20 Yes, the more, the merrier! Here is a new patch with the additional=20 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 --------------050507040608080501030503 Content-Type: text/x-patch; name="parameter-nohalt-ia64.patch" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="parameter-nohalt-ia64.patch" --- 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. --------------050507040608080501030503--