From owner-freebsd-xen@FreeBSD.ORG  Tue Feb 18 16:46:55 2014
Return-Path: <owner-freebsd-xen@FreeBSD.ORG>
Delivered-To: freebsd-xen@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 9AE4044B
 for <freebsd-xen@freebsd.org>; Tue, 18 Feb 2014 16:46:55 +0000 (UTC)
Received: from mail.tdx.com (mail.tdx.com [62.13.128.18])
 by mx1.freebsd.org (Postfix) with ESMTP id 3499019FF
 for <freebsd-xen@freebsd.org>; Tue, 18 Feb 2014 16:46:54 +0000 (UTC)
Received: from Mail-PC.tdx.co.uk (storm.tdx.co.uk [62.13.130.251])
 (authenticated bits=0)
 by mail.tdx.com (8.14.3/8.14.3/) with ESMTP id s1IGkfTG088879
 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
 Tue, 18 Feb 2014 16:46:42 GMT
Date: Tue, 18 Feb 2014 16:46:40 +0000
From: Karl Pielorz <kpielorz_lst@tdx.co.uk>
To: =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= <roger.pau@citrix.com>,
 freebsd-xen@freebsd.org
Subject: Re: Xen PV Networking issue - disable PV NIC in XENHVM FreeBSD?
Message-ID: <45B62F4EC5BB836857AF0763@Mail-PC.tdx.co.uk>
In-Reply-To: <A525C8B38681D6FA6F5C4AE4@Mail-PC.tdx.co.uk>
References: <D280F84BE886E8D6110B93D0@study64.tdx.co.uk>
 <52F8FE87.1010705@citrix.com> <72C34BC121BD5A0FBDAEFA37@Mail-PC.tdx.co.uk>
 <52FA5BEA.6030307@citrix.com> <A525C8B38681D6FA6F5C4AE4@Mail-PC.tdx.co.uk>
X-Mailer: Mulberry/4.0.8 (Win32)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
X-BeenThere: freebsd-xen@freebsd.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: Discussion of the freebsd port to xen - implementation and usage
 <freebsd-xen.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-xen>,
 <mailto:freebsd-xen-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-xen/>
List-Post: <mailto:freebsd-xen@freebsd.org>
List-Help: <mailto:freebsd-xen-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-xen>,
 <mailto:freebsd-xen-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 18 Feb 2014 16:46:55 -0000



--On 17 February 2014 09:46 +0000 Karl Pielorz <kpielorz_lst@tdx.co.uk> 
wrote:

>   ifconfig xnX -rxcsum -txcsum
>
> Does actually fix the problem.

Sadly this doesn't. It seems my testing was flawed (unknownly from a VM on 
another XenServer - which never exhibited the problem).

Real users today noticed the issue (trying to connect out from VM's on the 
same XenServer as the default gateway FreeBSD VM).

As replacing that VM with a CentOS PV host fixes the issue, it must be a 
bug within the FreeBSD PV NIC code somewhere?

[I posted a followup post to xs-devel as well, incase anyone else stumbles 
into the issue and things the rxcsum thing will fix it].

-Karl