From owner-cvs-src@FreeBSD.ORG Sat Nov 6 23:53:12 2004 Return-Path: Delivered-To: cvs-src@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E803A16A4CE; Sat, 6 Nov 2004 23:53:12 +0000 (GMT) Received: from www.cryptography.com (li-22.members.linode.com [64.5.53.22]) by mx1.FreeBSD.org (Postfix) with ESMTP id AFB3843D3F; Sat, 6 Nov 2004 23:53:12 +0000 (GMT) (envelope-from nate@root.org) Received: from [10.0.5.50] (adsl-64-171-186-185.dsl.snfc21.pacbell.net [64.171.186.185]) by www.cryptography.com (8.12.8/8.12.8) with ESMTP id iA6NrAFp000602 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Sat, 6 Nov 2004 15:53:11 -0800 Message-ID: <418D632E.2020402@root.org> Date: Sat, 06 Nov 2004 15:50:06 -0800 From: Nate Lawson User-Agent: Mozilla Thunderbird 0.7.3 (Windows/20040803) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Max Laier References: <200411061133.iA6BXhHT086940@repoman.freebsd.org> <20041106163748.GB38881@ip.net.ua> <200411061859.56624.max@love2party.net> In-Reply-To: <200411061859.56624.max@love2party.net> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: cvs-src@freebsd.org cc: src-committers@freebsd.org cc: Poul-Henning Kamp cc: cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/kern subr_param.c X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 06 Nov 2004 23:53:13 -0000 Max Laier wrote: > On Saturday 06 November 2004 17:37, Ruslan Ermilov wrote: >>On Sat, Nov 06, 2004 at 11:33:43AM +0000, Poul-Henning Kamp wrote: >> >>>phk 2004-11-06 11:33:43 UTC >>> >>> FreeBSD src repository >>> >>> Modified files: >>> sys/kern subr_param.c >>> Log: >>> Increase default HZ for i386 to 1000 >>> >>> Revision Changes Path >>> 1.65 +6 -4 src/sys/kern/subr_param.c >> >>What's the motivation for this change? Also, NOTES > > This has been discussed here: > http://lists.freebsd.org/pipermail/freebsd-arch/2004-November/003085.html I was traveling out of the country so I didn't get a chance to comment. The two caveats I'm aware of is a slight loss in processes that are CPU bound and an audio hum from ACPI CPU idling. The latter is rather interesting actually. At hz=100, it's just a quiet low buzz but at 1000, it is readily audible on many laptops and annoying. Windows uses hz=1000 too and has the same problem. I believe it's related to the capacitors and other devices charging/discharging when clocks are stopped. I'm fine with this change and just wanted to make sure people know where these behavioral changes are coming from when reports come in. -- Nate