From owner-freebsd-stable@FreeBSD.ORG Wed Feb 23 14:04:03 2005 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C213516A4CE for ; Wed, 23 Feb 2005 14:04:03 +0000 (GMT) Received: from rproxy.gmail.com (rproxy.gmail.com [64.233.170.204]) by mx1.FreeBSD.org (Postfix) with ESMTP id D28FE43D60 for ; Wed, 23 Feb 2005 14:04:02 +0000 (GMT) (envelope-from chrcoluk@gmail.com) Received: by rproxy.gmail.com with SMTP id a41so681722rng for ; Wed, 23 Feb 2005 06:03:59 -0800 (PST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:references; b=VX30zA53cSVLm3Lp7etEqPw/DN+RZm//aghfdCN9BWxNn20RN4X2cf4cpr27k7g/4CRvPE6sri2gE4GCTEna/Vz+HHtdaQS5Yu9ofWmweDeCsRNAGiIVL7z9dxjg8Z1AZwN3yw/GDto63q3AX64oSy2WxvPjjeg3vuz17+LmcJE= Received: by 10.38.12.9 with SMTP id 9mr143627rnl; Wed, 23 Feb 2005 06:03:58 -0800 (PST) Received: by 10.39.1.32 with HTTP; Wed, 23 Feb 2005 06:03:58 -0800 (PST) Message-ID: <3aaaa3a05022306033a4f3d96@mail.gmail.com> Date: Wed, 23 Feb 2005 14:03:58 +0000 From: Chris To: Kevin Oberman In-Reply-To: <20050222220009.C3DA25D07@ptavv.es.net> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit References: <20050222214821.GA66879@epia2.farid-hajji.net> <20050222220009.C3DA25D07@ptavv.es.net> cc: Emanuel Strobl cc: freebsd-stable@freebsd.org cc: Robert Watson cc: cpghost@cordula.ws Subject: Re: HZ=1000 on slow CPUs considered harmful? X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: Chris List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Feb 2005 14:04:03 -0000 I have noticed issues with HZ=1000 on a celeron 2ghz and a AMD64 3.2ghz, both caused problems with glftpd app and I had to recompile kernel back to default HZ=100 to fix, I have also noticed HZ=1000 add latency on my celeron box. Chris On Tue, 22 Feb 2005 14:00:09 -0800, Kevin Oberman wrote: > > Date: Tue, 22 Feb 2005 22:48:21 +0100 > > From: cpghost@cordula.ws > > > > On Tue, Feb 22, 2005 at 07:56:03PM +0000, Robert Watson wrote: > > > In 6-CURRENT, HZ is 1000 for amd64, i386, and ia64, but 100 for other > > > platforms (i.e., ppc, arm, and alpha). I'm not opposed to merging the HZ > > > change to RELENG_5 at some point, but given that occasional nits, such as > > > the TCP nit, are turning up, I think it's worth waiting until after 5.4. > > > > Wouldn't that be a problem for slow CPUs like VIA C3 (EPIA) or GEODE > > (Soekris)? For fast CPUs, it's not that much overhead, but for slow > > CPUs? > > > > Can HZ remain user-configurable? > > > > > Robert N M Watson > > > > Thanks, > > -cpghost. > > > > -- > > Cordula's Web. http://www.cordula.ws/ > > > > As far as I know, no one is talking about removing the knob. I believe > the issue is the default value changing from 100 to 1000. There are many > boxes that would not be very happy with 1000. I'm sure that there are > many 75 MHz Pentiums and 66 MHz 486s still running FreeBSD and even running > V5. > -- > R. Kevin Oberman, Network Engineer > Energy Sciences Network (ESnet) > Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) > E-mail: oberman@es.net Phone: +1 510 486-8634 > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >