From: Keir Fraser Subject: Re: [Patch 2 of 2]: PV-domain SMP performance Linux-part Date: Fri, 19 Dec 2008 09:56:03 +0000 Message-ID: References: <494B7892.76E4.0078.0@novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <494B7892.76E4.0078.0@novell.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Jan Beulich Cc: George Dunlap , Juergen Gross , "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org On 19/12/2008 09:33, "Jan Beulich" wrote: >>>> Keir Fraser 19.12.08 10:10 >>> >> I haven't seen any win on any real world setup. So I remain unconvinced, and >> it'll need more than you alone championing the patch to get it in. There >> have been no other general comments so far (Jan's have been about specific >> details). > > I think I'd generally welcome a change like this, but I'm not certain how far > I feel convinced that the submission meets one very basic criteria: > avoidance of mis-use of the feature by a domain (simply stating that a vCPU > will be de-scheduled after 1ms anyway doesn't seem sufficient to me). This > might need to include ways to differentiate between Dom0/DomU and/or > CPU- vs IO-bound vCPU-s. The most likely person to comment on that in the coming weeks would be George, who's kindly signed up to do some design work on the scheduler. -- Keir