From owner-freebsd-ppc@FreeBSD.ORG Thu Jul 25 10:13:20 2013 Return-Path: Delivered-To: freebsd-ppc@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 4E223AA2; Thu, 25 Jul 2013 10:13:20 +0000 (UTC) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl [188.252.31.196]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id ABA9A2DA1; Thu, 25 Jul 2013 10:13:19 +0000 (UTC) Received: from wojtek.tensor.gdynia.pl (localhost [127.0.0.1]) by wojtek.tensor.gdynia.pl (8.14.7/8.14.7) with ESMTP id r6P9p2b2012860; Thu, 25 Jul 2013 11:51:02 +0200 (CEST) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Received: from localhost (wojtek@localhost) by wojtek.tensor.gdynia.pl (8.14.7/8.14.7/Submit) with ESMTP id r6P9p2UC012857; Thu, 25 Jul 2013 11:51:02 +0200 (CEST) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Date: Thu, 25 Jul 2013 11:51:02 +0200 (CEST) From: Wojciech Puchar To: Super Bisquit Subject: Re: Kern.hz= +1 hertz at anything 2500 and above. In-Reply-To: Message-ID: References: User-Agent: Alpine 2.00 (BSF 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.4.3 (wojtek.tensor.gdynia.pl [127.0.0.1]); Thu, 25 Jul 2013 11:51:02 +0200 (CEST) Cc: FreeBSD Hackers , freebsd-current , FreeBSD PowerPC ML X-BeenThere: freebsd-ppc@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Porting FreeBSD to the PowerPC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Jul 2013 10:13:20 -0000 > improved with a higher kern.hz rating. Unless the future holds an emu20k2, > there will be RAM used from the motherboard. > 1. I will need a real-time or a faster kernel- hence the high rate wanted- > because the devices to be built will be used in an active environment: art, > music, audio control. > 2. Any system with limited memory and a low CPU hertz rate benefits from > the higher kern.hz setting. rather opposite. more kern.hz=more interrupts. > 3. Why not? If it works for PowerPC, SPARC64, AMD64, and i386 then it may > work for other architectures. > 4. Some applications may be ran from within a jail. > > > On Wed, Jul 24, 2013 at 8:16 PM, Adrian Chadd wrote: > >> Well, why is it reducing latency? That's the thing you should investigate. >> >> Is it because processes aren't getting enough time? or too much time? >> Or the audio device isn't getting enough time to run? etc. >> >> >> >> -adrian >> >> On 24 July 2013 15:35, Super Bisquit wrote: >>> >> http://lists.freebsd.org/pipermail/freebsd-stable/2009-September/051789.html >>> >>> This is the thread that I was referring to earlier. Since the patch is >> for >>> 2009, what are the chances it would work with 10.x or 9.x? >>> >>> On PowerPC machines with a low MHz rate- or any machine with a CPU rate >> of >>> 800 MHz or less- increasing the kern.hz improves performance and cuts >> down >>> on latency. I am building audio applications and suites that are used in >>> different projects. A G3 based machine should be able to run a kernel >> with >>> kern.hz=5000 with no problem. Unfortunately, this cannot be done. >>> >>> @PowerPC: some of you may find that performance does increase at a higher >>> kern.hz rate. >>> >>> @Hackers & Current: What's the chance that the default rate limit can be >>> raised to 5k? >>> _______________________________________________ >>> freebsd-ppc@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-ppc >>> To unsubscribe, send any mail to "freebsd-ppc-unsubscribe@freebsd.org" >> > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" > >