From owner-freebsd-embedded@FreeBSD.ORG Mon Dec 19 04:20:27 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 1496D106566C; Mon, 19 Dec 2011 04:20:27 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-vx0-f182.google.com (mail-vx0-f182.google.com [209.85.220.182]) by mx1.freebsd.org (Postfix) with ESMTP id A32378FC08; Mon, 19 Dec 2011 04:20:26 +0000 (UTC) Received: by vcbfk1 with SMTP id fk1so6411210vcb.13 for ; Sun, 18 Dec 2011 20:20:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=z7Ppr4/Mleh7TOrRaTVH/dC6djcnKvbdDBvEu+sovgk=; b=RqaEB04kt1qTlJOrGMQLhRBH7Uz/FLMgwDZh9B4XSXTE7PlL7GlUqMX21VmSRHEpLq c1Tc+FPlt/t8/QGyUx+RbHXiDC50AKyLUZlf4WygHnCMAC+S+Yne1iXOgZz1lksKORiN 1e2oTPxDUNz0msVOUenjBsbKlZ3YCCMMKzEEM= MIME-Version: 1.0 Received: by 10.220.151.204 with SMTP id d12mr8638214vcw.40.1324268426055; Sun, 18 Dec 2011 20:20:26 -0800 (PST) Sender: adrian.chadd@gmail.com Received: by 10.52.26.50 with HTTP; Sun, 18 Dec 2011 20:20:25 -0800 (PST) In-Reply-To: References: <0F6CC18F-6973-42A2-AC03-F01BF59458AE@lassitu.de> <1100F70E-9DA9-4163-AC9A-423ECE5AA9A3@lassitu.de> <18CABB46-9B9A-41CB-8742-6723C5FF4D67@lassitu.de> Date: Sun, 18 Dec 2011 20:20:25 -0800 X-Google-Sender-Auth: mLbDvqV8tmuuXh4iFslJs3G7xnA Message-ID: From: Adrian Chadd To: Warner Losh Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: Oleksandr Tymoshenko , "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 04:20:27 -0000 On 18 December 2011 16:29, Warner Losh wrote: > What is it without WITNESS? =A0The performance numbers with WITNESS are g= enerally uninteresting for a deployed system. It's still ridiculously CPU intensive. :( It turns out trying to do those locks three times one each GPIO IO line fiddle is a bit over the top. Adrian