From owner-freebsd-current@FreeBSD.ORG Sun Oct 23 18:04:02 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 3ABCF16A41F for ; Sun, 23 Oct 2005 18:04:02 +0000 (GMT) (envelope-from nate@root.org) Received: from www.cryptography.com (li-22.members.linode.com [64.5.53.22]) by mx1.FreeBSD.org (Postfix) with ESMTP id 8A29F43D4C for ; Sun, 23 Oct 2005 18:04:01 +0000 (GMT) (envelope-from nate@root.org) Received: from [10.0.5.50] (ppp-71-139-0-107.dsl.snfc21.pacbell.net [71.139.0.107]) by www.cryptography.com (8.12.8/8.12.8) with ESMTP id j9NI3rxq024313 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Sun, 23 Oct 2005 11:04:00 -0700 Message-ID: <435BD088.30205@root.org> Date: Sun, 23 Oct 2005 11:03:52 -0700 From: Nate Lawson User-Agent: Mozilla Thunderbird 1.0.6 (Windows/20050716) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Alexander Leidinger 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> <20051023121338.3e253c97@Magellan.Leidinger.net> In-Reply-To: <20051023121338.3e253c97@Magellan.Leidinger.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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 18:04:02 -0000 Alexander Leidinger wrote: > 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... Change to C1 (which is just HLT). If it still makes noise, it's not your C2 or C3 sleep. -- Nate