From owner-freebsd-questions@freebsd.org Mon Oct 12 05:48:22 2015 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 9030BA0E1EA for ; Mon, 12 Oct 2015 05:48:22 +0000 (UTC) (envelope-from bc979@lafn.org) Received: from zoom.lafn.org (zoom.lafn.org [108.92.93.123]) by mx1.freebsd.org (Postfix) with ESMTP id 690BB11D5 for ; Mon, 12 Oct 2015 05:48:22 +0000 (UTC) (envelope-from bc979@lafn.org) Received: from [10.0.1.12] (static-71-177-216-148.lsanca.fios.verizon.net [71.177.216.148]) (authenticated bits=0) by zoom.lafn.org (8.14.7/8.14.9) with ESMTP id t9C5m3m8049393 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sun, 11 Oct 2015 22:48:05 -0700 (PDT) (envelope-from bc979@lafn.org) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) Subject: Re: Ethernet Errors From: Doug Hardie In-Reply-To: <9D927A93-DB81-4423-B556-31120DA3136B@elde.net> Date: Sun, 11 Oct 2015 22:48:03 -0700 Cc: FreeBSD - Content-Transfer-Encoding: quoted-printable Message-Id: <28F04ECC-AF7C-4089-808B-51807CD110A9@lafn.org> References: <9D927A93-DB81-4423-B556-31120DA3136B@elde.net> To: Terje Elde X-Mailer: Apple Mail (2.2104) X-Virus-Scanned: clamav-milter 0.98 at zoom.lafn.org X-Virus-Status: Clean X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Oct 2015 05:48:22 -0000 > On 11 October 2015, at 06:39, Terje Elde wrote: >=20 > On 11. okt. 2015, at 12:14, Doug Hardie wrote: >=20 >> Any ideas? >=20 > Seems you ruled out a lot of things. I'm wondering if it could be PSU = or EMI? >=20 > Also, is the asymetry in errors based on number of errors, or = percentage of errors of total packets in the direction? >=20 > Could the difference be explained by one interface receicing more, and = the other sending more, and the error percentage thus being about the = same? >=20 >> Unfortunately these servers are a 3 hour drive away at 1 AM. It=E2=80=99= s considerably longer during the day as I have to drive through Los = Angeles. >=20 > Next time you're there, probably doesn't hurt to check the wiring. Do = both run close to anything magnetic, such as PSUs, wall warts etc? >=20 > Oh, and in situations like these, I try to work in a habit of taking = pictures. Nice to have as a reference, without having to visit.=20 The input on one NIC has more packets in error and fewer total packets. = The output has more total packets and fewer error packets. The same = holds for the other NIC. There are several orders of magnitude in the = percentages. The cables are something I didn=E2=80=99t think about. I = will have them changed and see if that affects anything. =20