From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keir Fraser Subject: Re: [PATCH] x86: change IO-APIC ack method default for single IO-APIC systems Date: Wed, 21 Jan 2009 14:37:13 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: "Jiang, Yunhong" , Jan Beulich , "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org On 21/01/2009 14:23, "Jiang, Yunhong" wrote: > xen-devel-bounces@lists.xensource.com <> wrote: >> Ever since 3.0.2 we've been carrying this patch in our products. Since >> there was no indication that there would be anything wrong with the >> 'new' IO-APIC ack method added back then, we finally decided to drop >> this patch recently from SLE11, to find that the subsequent release >> candidate failed to work on at least on system without using > > This is a bit strange, a bit curios that do you know the reason that it not > working? Yes - this also -- there doesn't seem to be a good reason that the 'new' ack_type wouldn't work in all cases. We're also somewhat depending on it (or similar) for unmaskable MSIs. -- Keir