From owner-freebsd-stable@FreeBSD.ORG Fri Jan 17 23:38:56 2014 Return-Path: Delivered-To: freebsd-stable@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 22A3C82F for ; Fri, 17 Jan 2014 23:38:56 +0000 (UTC) Received: from mail-qa0-x235.google.com (mail-qa0-x235.google.com [IPv6:2607:f8b0:400d:c00::235]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id D66121663 for ; Fri, 17 Jan 2014 23:38:55 +0000 (UTC) Received: by mail-qa0-f53.google.com with SMTP id cm18so3933706qab.12 for ; Fri, 17 Jan 2014 15:38:55 -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=3QvAGvXNlENA2fgd0varWIr9qomtplAV6IejcDt7Ups=; b=eh2N7AFh1MftVrAGmZQ4J+AmvwBD/TwUULRwFNEaD6rp1vzjF6qacI0tfFV/y6krwP TcCBmCFD6behTizZ6Ksk9RinjAGJy+cjO7PPICgBhWsqOVVMCnpLxwi88uqkpUJvMP5k oVdNXHc/D0EbBs4+819A1/FC02VXQO0WuNUkF6YFB8GVUZFDETN6nm8msoY5RyKV1dmG 7BO+sutTvBvKJbCaPhlAspcQ/VcmRc5Dyzd2vltzk2irjEA54cc9E1IYm3fVnDG9TGkC 8TY6Hly1CHgq3YqYsjuJXGjGKGw4q0DSC94HRYvR/mLzHfajdXNrdZNz4e5/gUhdWruR SYtA== MIME-Version: 1.0 X-Received: by 10.140.42.180 with SMTP id c49mr7810305qga.24.1390001935061; Fri, 17 Jan 2014 15:38:55 -0800 (PST) Sender: adrian.chadd@gmail.com Received: by 10.224.52.8 with HTTP; Fri, 17 Jan 2014 15:38:54 -0800 (PST) In-Reply-To: <52D98A83.90805@sentex.net> References: <52D98A83.90805@sentex.net> Date: Fri, 17 Jan 2014 15:38:54 -0800 X-Google-Sender-Auth: OugcDvVwnME3tHk-OXAMMQ6kamU Message-ID: Subject: Re: forwarding performance with releng7 vs 8 vs 9 vs 10 on an Alix box From: Adrian Chadd To: Mike Tancsa Content-Type: text/plain; charset=ISO-8859-1 Cc: FreeBSD-STABLE Mailing List X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 17 Jan 2014 23:38:56 -0000 On 17 January 2014 11:54, Mike Tancsa wrote: > We have a couple of sites where we found it was possible to live lock / > crash an alix box if there were too many pps flowing across the unit in > RELENG_8. The same device with releng_7 did not show the same > behaviour. As these boxes are remote and the watchdog would kick in, I > was not able to debug things very much. Even back in the lab, it wasnt > always easy to trigger the crash synthetically, but I could. > > Has anyone done any network performance comparisons between the various > branches for speed and stability for single core embedded platforms like > the ALIX or Soekris ? No, but it would be nice to actually do that, then figure out why it's livelocking. I can introduce livelock in a single core of a much, much more powerful box by doing certain bad things. It's almost like the scheduler needs to have some kind of "fuck it, I'm going FIFO!" mode. -a