From owner-freebsd-hackers@FreeBSD.ORG Thu Mar 22 14:34:49 2012 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 584B5106567E; Thu, 22 Mar 2012 14:34:49 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-pb0-f54.google.com (mail-pb0-f54.google.com [209.85.160.54]) by mx1.freebsd.org (Postfix) with ESMTP id 1DB628FC1A; Thu, 22 Mar 2012 14:34:48 +0000 (UTC) Received: by pbcwz17 with SMTP id wz17so1929853pbc.13 for ; Thu, 22 Mar 2012 07:34:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; 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=VE+31/NnG96PHizrCyhCAkWqGtj7RZ0Vd8Vm5n0E5kA=; b=zym9lhPDGMVdluPuF98CE5LzeJ8Qx5N/uRKFvzrdIuDT8q3hEWASnb6wC4Swh0ZV2u 4VZBDblGdIgi2N512K2etcDbo7KPj4HMJzTsPNjkivnnYtt6bUpTSHylm0Uv5jwKWqad N/3+2w7ZWGwYLFnUpkniow53vUGPE7bpm0+n59hxb/ysCQZudjuM4HT5dS1HKb4n9Js4 EKEnjEsgAfUXjlH/s0gleb6uCnFcf+4HGIWEqJFM80eFrZBXoOqqaegGgdOzh6Vc0JNk 2RJODOBjr9BPF/N9NvAI9euHnmC9+aIgqUEBZ2DIEzk4Mcv0W+CzwMbapNJv0VCBDB2a KI/Q== MIME-Version: 1.0 Received: by 10.68.195.38 with SMTP id ib6mr9571085pbc.28.1332426888625; Thu, 22 Mar 2012 07:34:48 -0700 (PDT) Sender: adrian.chadd@gmail.com Received: by 10.143.33.5 with HTTP; Thu, 22 Mar 2012 07:34:48 -0700 (PDT) In-Reply-To: <201203220813.13113.jhb@freebsd.org> References: <20120322101041.GA99431@freebsd.org> <201203220813.13113.jhb@freebsd.org> Date: Thu, 22 Mar 2012 07:34:48 -0700 X-Google-Sender-Auth: xykJVteMYbaVvjQ-ZZOhPUczsjE Message-ID: From: Adrian Chadd To: John Baldwin Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-hackers@freebsd.org, Alexander Best Subject: Re: still issues with unreadable dmesg output on SMP systems X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Mar 2012 14:34:49 -0000 Hi, On 22 March 2012 05:13, John Baldwin wrote: > s/fixed/mostly worked around/ > > The problem is that the work around isn't perfect. =A0The root cause is s= till > not fixed. =A0avg@ has some ideas on better ways to handle this, but it i= s a bit > tricky to get this right since we also dont' want printfs to be delayed t= oo > much (and to fix this perfectly requires buffering printf output). I'm rapidly liking the brokenness of the IO. Why? Because it becomes _very freaking obvious_ when things are running concurrently. I've found many ath/net80211 bugs because of this. Having it as an option would be nice. :-) Adrian