From owner-freebsd-hackers@FreeBSD.ORG Wed Jul 24 22:35:20 2013 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id A25313FC; Wed, 24 Jul 2013 22:35:20 +0000 (UTC) (envelope-from superbisquit@gmail.com) Received: from mail-ob0-x232.google.com (mail-ob0-x232.google.com [IPv6:2607:f8b0:4003:c01::232]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 54D802FB1; Wed, 24 Jul 2013 22:35:20 +0000 (UTC) Received: by mail-ob0-f178.google.com with SMTP id fb19so14624837obc.9 for ; Wed, 24 Jul 2013 15:35:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=pOCzLiuKd1ibPU7fSZEMbQaqzFFolWANlKsPVycHvXU=; b=CpepZoWPcyNBrI2iHLW6/py5yBCbd0NzoPG9TG2ViHGGMvB2+XvAjM4lZxELw74Evr JYTDVgOHf/OBE2g+1ge6vgjR6uidp9yAgzqc6A1AnNi4fjidGAvODj8u81up7V7pDDYF Leg8HHlsSmwBrYqvTp78jqWTZw85ByL3s7act65QURVnI8yHvN9/y3CW/h04b5COhj0+ NNPxmwHq4vRqKSU1c0h00FbyfM0ASKo4MxjBL4R8zSuIHAvyARULH8O8r2eb0/fuQO1p en4nCe6huo9z9KAnAo7TSdFfsPO6+NmYPrtJPwSryxd/JOmTV9fIUmJhLL5Ppa1OYM3a riug== MIME-Version: 1.0 X-Received: by 10.60.125.100 with SMTP id mp4mr39048715oeb.60.1374705319592; Wed, 24 Jul 2013 15:35:19 -0700 (PDT) Received: by 10.182.115.194 with HTTP; Wed, 24 Jul 2013 15:35:19 -0700 (PDT) Date: Wed, 24 Jul 2013 18:35:19 -0400 Message-ID: Subject: Kern.hz= +1 hertz at anything 2500 and above. From: Super Bisquit To: FreeBSD PowerPC ML , FreeBSD Hackers , freebsd-current Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.14 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Jul 2013 22:35:20 -0000 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?