From owner-freebsd-embedded@FreeBSD.ORG Mon Dec 19 00:33:54 2011 Return-Path: Delivered-To: freebsd-embedded@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 0CBF3106566B; Mon, 19 Dec 2011 00:33:54 +0000 (UTC) (envelope-from imp@bsdimp.com) Received: from harmony.bsdimp.com (bsdimp.com [199.45.160.85]) by mx1.freebsd.org (Postfix) with ESMTP id B17D98FC15; Mon, 19 Dec 2011 00:33:53 +0000 (UTC) Received: from 63.imp.bsdimp.com (63.imp.bsdimp.com [10.0.0.63]) (authenticated bits=0) by harmony.bsdimp.com (8.14.4/8.14.3) with ESMTP id pBJ0TZLB039354 (version=TLSv1/SSLv3 cipher=DHE-DSS-AES128-SHA bits=128 verify=NO); Sun, 18 Dec 2011 17:29:35 -0700 (MST) (envelope-from imp@bsdimp.com) Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: text/plain; charset=us-ascii From: Warner Losh In-Reply-To: <18CABB46-9B9A-41CB-8742-6723C5FF4D67@lassitu.de> Date: Sun, 18 Dec 2011 17:29:33 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: References: <0F6CC18F-6973-42A2-AC03-F01BF59458AE@lassitu.de> <1100F70E-9DA9-4163-AC9A-423ECE5AA9A3@lassitu.de> <18CABB46-9B9A-41CB-8742-6723C5FF4D67@lassitu.de> To: Stefan Bethke X-Mailer: Apple Mail (2.1084) X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.0.1 (harmony.bsdimp.com [10.0.0.6]); Sun, 18 Dec 2011 17:29:36 -0700 (MST) Cc: Oleksandr Tymoshenko , Adrian Chadd , "freebsd-embedded@freebsd.org" Subject: Re: Updated switch/glue patch? X-BeenThere: freebsd-embedded@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Dedicated and Embedded Systems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Dec 2011 00:33:54 -0000 On Dec 18, 2011, at 3:17 AM, Stefan Bethke wrote: > I've reimplemented iicbb.c to be slightly more protocol compliant, and = to be able to tune transfer speeds to the actual hardware capabilities. = I've timed a single GETSCL (with WITNESS) to 8.7 microseconds, clearly = that won't do. What is it without WITNESS? The performance numbers with WITNESS are = generally uninteresting for a deployed system. Warner