Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753215AbZITHfA (ORCPT ); Sun, 20 Sep 2009 03:35:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752366AbZITHe7 (ORCPT ); Sun, 20 Sep 2009 03:34:59 -0400 Received: from lo.gmane.org ([80.91.229.12]:56123 "EHLO lo.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751764AbZITHe7 (ORCPT ); Sun, 20 Sep 2009 03:34:59 -0400 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Tim Blechmann Subject: Re: tickless and HZ=1000 throughput advantage? Date: Sun, 20 Sep 2009 09:34:30 +0200 Message-ID: <4AB5DB06.1090100@klingt.org> References: <6278d2220909190747n62f7036dj2e5231fcdc4730fb@mail.gmail.com> <20090919165501.65d77294@infradead.org> <6278d2220909191050l19f2a446r5ccf1907fd963096@mail.gmail.com> <1253401950.7587.7.camel@ben-desktop> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig6EF22EC2DCDBC4979089C98D" X-Complaints-To: usenet@ger.gmane.org Cc: Daniel J Blueman , Arjan van de Ven , Linux Kernel X-Gmane-NNTP-Posting-Host: 85-127-80-191.dynamic.xdsl-line.inode.at User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.3pre) Gecko/20090810 Lightning/1.0pre Shredder/3.0b4pre In-Reply-To: <1253401950.7587.7.camel@ben-desktop> X-Enigmail-Version: 0.96a Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1686 Lines: 46 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig6EF22EC2DCDBC4979089C98D Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 09/20/2009 01:12 AM, Ben Nizette wrote: > On Sat, 2009-09-19 at 18:50 +0100, Daniel J Blueman wrote: >=20 >> Agreed. Do you think there is still a small case for moving to HZ=3D10= 00 >> (given it's effectively free) in situations like: >=20 > Sure HZ=3D1000 gives you more accurate sleeps, that's kind of the point= , > but since when has it been "effectively free"? > http://lwn.net/Articles/331607/ i'd be curious, what effect does it have on userspace applications? like, does it effect the wakeup latency of userspace (pthread) mutexes/conditions or posix semaphores? thnx, tim --=20 tim@klingt.org http://tim.klingt.org Desperation is the raw material of drastic change. Only those who can leave behind everything they have ever believed in can hope to escape. William S. Burroughs --------------enig6EF22EC2DCDBC4979089C98D Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAkq12w8ACgkQdL+4qsZfVstmEgCeMcyFJRANTqGLcnjsIKTVBx2Z aIsAnioHKal47wGATMZQvACiO1+SzdQu =iGud -----END PGP SIGNATURE----- --------------enig6EF22EC2DCDBC4979089C98D-- -- 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/