From owner-freebsd-xen@FreeBSD.ORG Wed Jan 26 08:43:19 2011 Return-Path: Delivered-To: freebsd-xen@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 79E30106566B for ; Wed, 26 Jan 2011 08:43:19 +0000 (UTC) (envelope-from joovke@joovke.com) Received: from mail08.syd.optusnet.com.au (mail08.syd.optusnet.com.au [211.29.132.189]) by mx1.freebsd.org (Postfix) with ESMTP id D88358FC13 for ; Wed, 26 Jan 2011 08:43:18 +0000 (UTC) Received: from [172.16.0.242] (c122-106-11-245.rivrw1.nsw.optusnet.com.au [122.106.11.245]) by mail08.syd.optusnet.com.au (8.13.1/8.13.1) with ESMTP id p0Q8hGpw029495 for ; Wed, 26 Jan 2011 19:43:17 +1100 Message-ID: <4D3FDEA3.1070504@joovke.com> Date: Wed, 26 Jan 2011 19:43:15 +1100 From: Alex User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101208 Thunderbird/3.1.7 MIME-Version: 1.0 To: freebsd-xen@freebsd.org References: <4D3F94B0.4080704@joovke.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: Help! Network issue with freebsd + Xen X-BeenThere: freebsd-xen@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussion of the freebsd port to xen - implementation and usage List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jan 2011 08:43:19 -0000 Hi Janne, I don't know whether this is an issue with the "re" driver or something else that's affecting the "re" driver (the way Xen handles network traffic). Though as far as I know, when a collision is detected, the behavior is for the sender to invoke it's backoff algorithm and to wait a set amount of time before transmitting again. if this is actually occurring then there would be performance degradation. Would you mind adding your feedback on my PR up at freebsd.org just to let the "re" maintainer know it's not just me? The PR is 154236. Would Greatly appreciate it. Thanks in advance. On 26/01/11 17:59, Janne Snabb wrote: > On Wed, 26 Jan 2011, Alex wrote: > >> I am having an issue with high network interface collisions when running >> freebsd under XEN (I am using freebsd as my OS for a VPS). > [..] >> whether they have seen the same issue or know what may be causing it. > I can confirm seeing it here also, you are not alone: > > $ netstat -i > Name Mtu Network Address Ipkts Ierrs Idrop Opkts Oerrs Coll > re0 1500 00:16:3e:08:b4:c7 21150230 0 0 4101045 0 4019323 > [..] > > I had not noticed it before. I am not encountering any packet loss > or other networking problems. No idea about the reason. > > This is on FreeBSD 8.1-RELEASE-p2 amd64 with GENERIC kernel. > > -- > Janne Snabb / EPIPE Communications > snabb@epipe.com - http://epipe.com/ >