From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dominik Brodowski Subject: Re: Entering C3 Processor State without a Bus Arbiter Date: Fri, 16 Jan 2004 00:25:15 +0100 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <20040115232515.GA5386@dominikbrodowski.de> References: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="0OAP2g/MAC+5xKAE" Return-path: Content-Disposition: inline In-Reply-To: Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Dino Klein Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org --0OAP2g/MAC+5xKAE Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jan 15, 2004 at 05:29:23PM -0500, Dino Klein wrote: > Hello, >=20 > I'm curios as to why the implementation does not enter C3 without the pre= sence of a Bus Arbiter; also, how come a comment in the > source claims that C3/WBINVD is too expensive? [ /me shuffles in some old directories and finds a file called wbinvd_analy= sis ] I'd investigated this a couple of months ago. It turned out to hang my (previous) notebook every once in a while; I think that was the reason I aborted the patch... The average cost of a wbinvd instruction was 98us, the minimum cost 22us. However, the maximum cost was a horrible 780us. The average sleeping time of C3 was 519us, minimum 0us... This is discussed in detail in these threads: http://marc.theaimsgroup.com/?l=3Dacpi4linux&m=3D101630988127506&w=3D2 http://marc.theaimsgroup.com/?l=3Dacpi4linux&m=3D101662029010850&w=3D2 other threads (including my patches) can be found by searching for "wbinvd" in this archive. Dominik --0OAP2g/MAC+5xKAE Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQFAByFbZ8MDCHJbN8YRAhFxAKCGDJaZV+/dZUrLufOKLRGOWWfAYACeKaBW b+pr/oKODIfXtmjtTZ6HFks= =jyDK -----END PGP SIGNATURE----- --0OAP2g/MAC+5xKAE-- ------------------------------------------------------- The SF.Net email is sponsored by EclipseCon 2004 Premiere Conference on Open Tools Development and Integration See the breadth of Eclipse activity. February 3-5 in Anaheim, CA. http://www.eclipsecon.org/osdn