From owner-freebsd-net@FreeBSD.ORG Tue Dec 4 19:34:37 2012 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 7CCC42E4; Tue, 4 Dec 2012 19:34:37 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-wi0-f180.google.com (mail-wi0-f180.google.com [209.85.212.180]) by mx1.freebsd.org (Postfix) with ESMTP id D9EA98FC0C; Tue, 4 Dec 2012 19:34:36 +0000 (UTC) Received: by mail-wi0-f180.google.com with SMTP id hj13so854359wib.13 for ; Tue, 04 Dec 2012 11:34:35 -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 :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=nOwx4cI4NlCjeGnwjUHbdLlEYhtNXtuMfHL3cRMCfUM=; b=I8j4+NOl/OdkArwgmSZP1baSk+2pfcWYBRVLGMBLTHNpdQbG5wP3RZX70fG4O9fwHd kbM7pbs1hqtaoEyzjgnwOCe79BdBA/oEHXyriR0lpEhv/+5ADx5UZ18cVFRwnr2FIhze qXC0pNL+t+k+P6istLvFVCzGEIAVTRCgOnkqGl5un5rwnB65GKiGH57G/VMKmYCfzwZ7 96T2cAyYvB3GGUisc+t2oU5DWEx/yMaN0MCBzcQuSkzRrOuRozIg38u2Pv5YdDbHtgmc uCl5Cqh9rfM75OLwKd8Wuf4ZSXAW4qkcVtyDZjVt6BVe+nZ+tveLPJj85FQlLjgRKkdo I3mQ== MIME-Version: 1.0 Received: by 10.216.85.211 with SMTP id u61mr5672480wee.212.1354649675658; Tue, 04 Dec 2012 11:34:35 -0800 (PST) Sender: adrian.chadd@gmail.com Received: by 10.217.57.9 with HTTP; Tue, 4 Dec 2012 11:34:35 -0800 (PST) In-Reply-To: <201212041108.17645.jhb@freebsd.org> References: <1353259441.19423.YahooMailClassic@web121605.mail.ne1.yahoo.com> <201212041108.17645.jhb@freebsd.org> Date: Tue, 4 Dec 2012 11:34:35 -0800 X-Google-Sender-Auth: ouURajnVNcCsSzqsreuwjeeKdNU Message-ID: Subject: Re: Latency issues with buf_ring From: Adrian Chadd To: John Baldwin Content-Type: text/plain; charset=ISO-8859-1 Cc: Barney Cordoba , freebsd-net@freebsd.org X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Dec 2012 19:34:37 -0000 .. and it's important to note that buf_ring itself doesn't have the race condition; it's the general driver implementation that's racy. I have the same races in ath(4) with the watchdog programming. Exactly the same issue. Adrian