From owner-freebsd-arm@FreeBSD.ORG Fri Dec 20 20:31:55 2013 Return-Path: Delivered-To: freebsd-arm@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 ESMTPS id E52F8BEF; Fri, 20 Dec 2013 20:31:55 +0000 (UTC) Received: from mail-qa0-x236.google.com (mail-qa0-x236.google.com [IPv6:2607:f8b0:400d:c00::236]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 8F53A180F; Fri, 20 Dec 2013 20:31:55 +0000 (UTC) Received: by mail-qa0-f54.google.com with SMTP id f11so3041585qae.20 for ; Fri, 20 Dec 2013 12:31:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=rh2/Y1+za8XoYCmwI88Fcek3PsjUu6Oen/+xC7Hhpjo=; b=ptwTxa1oWvWV/6Mo1IFWxJ5J91UjGYfVal2YrJ2ASrAxheEAF/Arh7ncVVR1fsKH5t n/9ZYB2nwtA9QXem91STZ+eY0CJUheV4J00v9plrfc5Qr5TB60OqvH2a1AJojKDseLqN /C0IGmRTZqxmqwjqfUZnpHc6pkMbiOB46umu9CYTV2oVzOzs4cRdgFMnriFvwjxSu0pX NLyuxlcu9mlbMVzYjHc4QukWPbEmiaXuOrxIFd5KVKz9Q5zqvbiL1F3yEKQ0SNdm7JLA 7YEJAmqRd7ty3aGwUsS9SVVCqPo2C5I6BJ8izPwQ7R82YMoAlKMNp3m27wZrNN3RH6TC eWFg== MIME-Version: 1.0 X-Received: by 10.224.16.204 with SMTP id p12mr18111898qaa.26.1387571514798; Fri, 20 Dec 2013 12:31:54 -0800 (PST) Sender: adrian.chadd@gmail.com Received: by 10.224.53.200 with HTTP; Fri, 20 Dec 2013 12:31:54 -0800 (PST) In-Reply-To: References: <05740C4C-4B02-4567-9E46-E739ECEDA797@bsdimp.com> Date: Fri, 20 Dec 2013 12:31:54 -0800 X-Google-Sender-Auth: TM8fE3zLWEWO7_E7hIb-sDmCmfg Message-ID: Subject: Re: R-PI fixes for dhclient/sshd? From: Adrian Chadd To: Zbigniew Bodek Content-Type: text/plain; charset=ISO-8859-1 Cc: "freebsd-arm@freebsd.org" X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Dec 2013 20:31:56 -0000 On 20 December 2013 12:24, Zbigniew Bodek wrote: >> Thanks for the update. >> >> What would be the harm in reverting the patch? >> >> http://svnweb.freebsd.org/base/head/sys/arm/arm/pmap-v6.c?r1=251370&r2=252694&pathrev=252694 >> > > Hello again. > > I guess it should be some performance impact since we will need to > write all pages marked as RW to backing > storage on page-out. This is regardless of its actual dirty state (no > modified emulation). > But this was how it behaved earlier and nothing bad happened so it > might be worth to temporary revert it and > debug the problem without the negative influence on the users. After > proper fix we should apply it again. > > It's up to you. I have no objections to that (I have few other patches > that need to wait for pmap problems > resolution anyway like pmap_copy() + SP). Ok. ARM people - does anyone see any particular problems reverting this patch for now so the armv6 stuff is usable? It's likely worth filing a PR for this with the very relevant information for the bug, so I'll go and do that now. Thanks to everyone who replied! -adrian