From owner-freebsd-current@FreeBSD.ORG Sun Oct 23 10:13:47 2005 Return-Path: X-Original-To: current@freebsd.org Delivered-To: freebsd-current@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4C24116A41F for ; Sun, 23 Oct 2005 10:13:47 +0000 (GMT) (envelope-from Alexander@Leidinger.net) Received: from www.ebusiness-leidinger.de (jojo.ms-net.de [84.16.236.246]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9E6AC43D45 for ; Sun, 23 Oct 2005 10:13:45 +0000 (GMT) (envelope-from Alexander@Leidinger.net) Received: from Andro-Beta.Leidinger.net (p54A5F264.dip.t-dialin.net [84.165.242.100]) (authenticated bits=0) by www.ebusiness-leidinger.de (8.13.1/8.13.1) with ESMTP id j9N9siGW010554; Sun, 23 Oct 2005 11:54:44 +0200 (CEST) (envelope-from Alexander@Leidinger.net) Received: from Magellan.Leidinger.net (Magellan.Leidinger.net [192.168.1.1]) by Andro-Beta.Leidinger.net (8.13.3/8.13.3) with ESMTP id j9NADdfK096255; Sun, 23 Oct 2005 12:13:39 +0200 (CEST) (envelope-from Alexander@Leidinger.net) Date: Sun, 23 Oct 2005 12:13:38 +0200 From: Alexander Leidinger To: Nate Lawson Message-ID: <20051023121338.3e253c97@Magellan.Leidinger.net> In-Reply-To: <4357E137.5090703@root.org> References: <200510172310.j9HNAVPL013057@repoman.freebsd.org> <20051018094402.A29138@grasshopper.cs.duke.edu> <435501B9.4070401@samsco.org> <43553162.5040802@root.org> <20051020141023.0ejwdv4dss48wko0@netchild.homeip.net> <4357E137.5090703@root.org> X-Mailer: Sylpheed-Claws 1.9.15 (GTK+ 2.6.10; i386-portbld-freebsd7.0) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new Cc: current@freebsd.org Subject: Re: 1kHz noise from C3 sleep X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 23 Oct 2005 10:13:47 -0000 On Thu, 20 Oct 2005 11:25:59 -0700 Nate Lawson wrote: > Alexander Leidinger wrote: > > Nate Lawson wrote: > > > > [Moving to -current] > > > >>> I wonder if moving to HZ=1000 on amd64 and i386 was really all that good > >>> of an idea. Having preemption in the kernel means that ithreads can run > >>> right away instead of having to wait for a tick, and various fixes to > >>> 4BSD in the past year have eliminated bugs that would make the CPU wait > >>> for up to a tick to schedule a thread. So all we're getting now is a > >>> 10x increase in scheduler overhead, including reading the timecounters. > >> > >> > >> I use hz=100 on my systems due to the 1 khz noise from C3 sleep. > >> Windows has the same problem. > > > > > > My laptop makes noises when being (more or less) idle (I think I enabled > > C3...). Does this mean I should try to change HZ? > > Sure, you can do it from a tunable (kern.hz I think), you don't have to > recompile. No, a HZ of 100 doesn't work, the laptop still makes noises. And it only has C2, no C3... Bye, Alexander. -- Loose bits sink chips. http://www.Leidinger.net Alexander @ Leidinger.net GPG fingerprint = C518 BC70 E67F 143F BE91 3365 79E2 9C60 B006 3FE7