From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lists.gentoo.org ([140.105.134.102] helo=robin.gentoo.org) by nuthatch.gentoo.org with esmtp (Exim 4.62) (envelope-from ) id 1Hp48i-0006sw-KP for garchives@archives.gentoo.org; Fri, 18 May 2007 15:13:09 +0000 Received: from robin.gentoo.org (localhost [127.0.0.1]) by robin.gentoo.org (8.14.0/8.14.0) with SMTP id l4IFBFoK007475; Fri, 18 May 2007 15:11:15 GMT Received: from rwcrmhc12.comcast.net (rwcrmhc12.comcast.net [216.148.227.152]) by robin.gentoo.org (8.14.0/8.14.0) with ESMTP id l4IFBEiT007470 for ; Fri, 18 May 2007 15:11:15 GMT Received: from crud.mn.org (c-66-41-30-59.hsd1.mi.comcast.net[66.41.30.59]) by comcast.net (rwcrmhc12) with SMTP id <20070518151113m12006pjote>; Fri, 18 May 2007 15:11:13 +0000 Received: (qmail 4553 invoked by uid 501); 18 May 2007 15:11:12 -0000 Date: Fri, 18 May 2007 10:11:11 -0500 From: Barry.SCHWARTZ@chemoelectric.org To: gentoo-amd64@lists.gentoo.org Subject: Re: [gentoo-amd64] Choice of processor timer frequency? Message-ID: <20070518151111.GA4048@crud.crud.mn.org> References: <200705181126.48654.prh@gotadsl.co.uk> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-amd64@gentoo.org Reply-to: gentoo-amd64@lists.gentoo.org MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="tThc/1wpZn/ma/RB" Content-Disposition: inline In-Reply-To: <200705181126.48654.prh@gotadsl.co.uk> User-Agent: Mutt/1.5.15 (2007-04-06) X-Archives-Salt: 7b300479-2dde-49f1-be41-dc011bc4ed1a X-Archives-Hash: a06fd0a550e282a0ff3e64731f210752 --tThc/1wpZn/ma/RB Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Peter Humphrey skribis: > It's just occurred to me to question this kernel configuration option, wh= ich=20 > is under Processor Type and Features. >=20 > We used to have to choose from 100, 250 and 1000 Hz, but recently 300 Hz = has=20 > been added, with the following Help text: >=20 > ---- > CONFIG_HZ_300: > 300 Hz is a good compromise choice allowing server performance while also= =20 > showing good interactive responsiveness even on SMP and NUMA systems and= =20 > exactly dividing by both PAL and NTSC frame rates for video and multimedi= a=20 > work. > ---- >=20 > At first I followed the advice without thought, but on reflection it occu= rs=20 > to me to wonder about the truth of this statement. I suspect it's only tr= ue=20 > in North America, northern Japan and a few other places, where the public= =20 > supply frequency is 60 Hz. In the rest of the world, with its 50 Hz, I=20 > think 250 would be a better choice. >=20 > I also think it would be more accurate to say "dividing exactly into"=20 > than "by". > > Would anyone like to comment? It should say 'divide by', and the frame rate is a property of the television signal, not the power supply. --=20 Barry.SCHWARTZ =C4=89e chemoelectric punkto org http://chemoelectric.org Free stuff / Senpagaj varoj: http://crudfactory.com 'Democracies don't war; democracies are peaceful countries.' - Bush (http://www.whitehouse.gov/news/releases/2005/12/20051219-2.html) --tThc/1wpZn/ma/RB Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (GNU/Linux) iD8DBQFGTcIPBNGXDWV0vIMRAu9nAJ0THM8U6oSItHP1msBUDeoR+hO2wgCfQN8n NrwrK3Ca/4efu3UBQDmGL/0= =kKc0 -----END PGP SIGNATURE----- --tThc/1wpZn/ma/RB-- -- gentoo-amd64@gentoo.org mailing list