Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266511AbUJVS7U (ORCPT ); Fri, 22 Oct 2004 14:59:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267765AbUJVS66 (ORCPT ); Fri, 22 Oct 2004 14:58:58 -0400 Received: from moraine.clusterfs.com ([66.246.132.190]:54669 "EHLO moraine.clusterfs.com") by vger.kernel.org with ESMTP id S266250AbUJVS5w (ORCPT ); Fri, 22 Oct 2004 14:57:52 -0400 Date: Fri, 22 Oct 2004 12:57:50 -0600 From: Andreas Dilger To: Lee Revell Cc: Alan Cox , Linux Kernel Mailing List , Robert Love Subject: Re: How is user space notified of CPU speed changes? Message-ID: <20041022185750.GT26297@schnapps.adilger.int> Mail-Followup-To: Lee Revell , Alan Cox , Linux Kernel Mailing List , Robert Love References: <1098399709.4131.23.camel@krustophenia.net> <1098444170.19459.7.camel@localhost.localdomain> <1098468316.5580.18.camel@krustophenia.net> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="yklP1rR72f9kjNtc" Content-Disposition: inline In-Reply-To: <1098468316.5580.18.camel@krustophenia.net> User-Agent: Mutt/1.4.1i X-GPG-Key: 1024D/0D35BED6 X-GPG-Fingerprint: 7A37 5D79 BF1B CECA D44F 8A29 A488 39F5 0D35 BED6 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1617 Lines: 48 --yklP1rR72f9kjNtc Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Oct 22, 2004 14:05 -0400, Lee Revell wrote: > On Fri, 2004-10-22 at 07:23, Alan Cox wrote: > > No it did not. It has never been a safe assumption. Even my old PC110 > > does APM non-linux assisted shifts between 8 16 and 33Mhz. In addition > > there are boxes with dual CPU's and different multipliers - dual=20 > > 300/450's were not uncommon. > >=20 > > And thats before we even mention such things at hyped-threading. >=20 > Seems like you are implying that any userspace app that needs to know > the CPU speed is broken. Is this correct? Sadly, if I boot my laptop on battery and then plug it in, all of my MP3s run twice (or whatever) as fast (XMMS on 2.4), making them sound like the Chipmunks on crack. I have to reboot my system while plugged in to listen to music. Cheers, Andreas -- Andreas Dilger http://sourceforge.net/projects/ext2resize/ http://members.shaw.ca/adilger/ http://members.shaw.ca/golinux/ --yklP1rR72f9kjNtc Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQFBeVgupIg59Q01vtYRAv7hAJ9PQ0AIFSZRqHYtVk58us39la+38ACg6P2a SYyywfeDAwVCJYpgOwx2B+A= =zhij -----END PGP SIGNATURE----- --yklP1rR72f9kjNtc-- - 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/