From owner-freebsd-net@FreeBSD.ORG Tue Jul 5 23:48:44 2011 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 642ED106566C for ; Tue, 5 Jul 2011 23:48:44 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from asmtpout029.mac.com (asmtpout029.mac.com [17.148.16.104]) by mx1.freebsd.org (Postfix) with ESMTP id 4D8F08FC25 for ; Tue, 5 Jul 2011 23:48:44 +0000 (UTC) MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; CHARSET=US-ASCII Received: from cswiger1.apple.com ([17.209.4.71]) by asmtp029.mac.com (Oracle Communications Messaging Exchange Server 7u4-20.01 64bit (built Nov 21 2010)) with ESMTPSA id <0LNV00KL4U0IE740@asmtp029.mac.com> for freebsd-net@freebsd.org; Tue, 05 Jul 2011 15:48:18 -0700 (PDT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.4.6813,1.0.211,0.0.0000 definitions=2011-07-05_08:2011-07-05, 2011-07-05, 1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 ipscore=0 suspectscore=0 phishscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx engine=6.0.2-1012030000 definitions=main-1107050208 From: Chuck Swiger In-reply-to: Date: Tue, 05 Jul 2011 15:48:18 -0700 Message-id: References: To: Charles Sprickman X-Mailer: Apple Mail (2.1084) Cc: freebsd-net@freebsd.org Subject: Re: bce packet loss X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 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, 05 Jul 2011 23:48:44 -0000 On Jul 4, 2011, at 6:32 PM, Charles Sprickman wrote: > We're running a few 8.1-R servers with Broadcom bce interfaces (Dell R510) and I'm seeing occasional packet loss on them (enough that it trips nagios now and then). Cabling seems fine as neither the switch nor the sysctl info for the device show any errors/collisions/etc, however there is one odd one, which is "dev.bce.1.stat_IfHCInBadOctets: 539369". See [1] below for full sysctl output. The switch shows no errors but for "Dropped packets 683868". A quick check of the #'s is showing an error rate of 8.6e-6, or about one byte out of 100,000. That's much better than what TCP/IP and ethernet were designed for. At a guess, your box or the switch occasionally gets busy enough that it drops a few packets now and again. Regards, -- -Chuck