From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keir Fraser Subject: Re: Xen/AoE skb frag array incompatibility Date: Fri, 08 Dec 2006 06:27:30 +0000 Message-ID: References: <4578C732.1020206@ultraviolet.org> Mime-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4578C732.1020206@ultraviolet.org> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Tracy R Reed , xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Is there a clear technical description of what the problem is? I see three problems vaguely referred to in this email: 1. Build failure on skb_linearize() 2. Warnings about 'can't schedule work' 3. Some unspecified problem with frag lists If someone digs into the problem a bit and points us at some code we can probably advise what should be done. -- Keir On 8/12/06 2:00 am, "Tracy R Reed" wrote: > Greetings, Xen developers! > > I have been using AoE with Xen to great effect and I am very pleased > with how the whole system has worked out. The two technologies really > complement each other. I consider it the ultimate setup. Aside from the > network switch (eventually to be remedied) my serving infrastructure has > zero single points of failure. > > However, this virtualization paradise has a flaw: There seems to be some > sort of incompatibility in the way AoE uses the skb frag array in the > latest version of AoE (6-40) and in the way Xen uses it. This causes new > AoE block devices to fail to be accessible among potentially other problems. > > Is anyone aware of this problem? It is not clear to me if it is a > problem with Xen or if the fault lies in AoE. I have looked into it a > bit but my kernel hacking talents are rather meager. Attached is a > recent email from the AoE list discussing it. If you have any > suggestions for the AoE folks they can be reached over at > aoetools-discuss@lists.sourceforge.net