From mboxrd@z Thu Jan 1 00:00:00 1970 From: NISHIGUCHI Naoki Subject: Re: [RFC] Add static priority into credit scheduler Date: Fri, 27 Mar 2009 11:39:38 +0900 Message-ID: <49CC3C6A.6050308@jp.fujitsu.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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: George Dunlap , "Su, Disheng" Cc: Xen-devel List-Id: xen-devel@lists.xenproject.org Hi Disheng and George, Disheng, I'm glad to see your work. George Dunlap wrote: > I'd be interested to hear others' opinions. I think that static priority is useful under some conditions. But, as George said, I also think it is harder to configure properly. And I'm anxious that it makes credits on non-RT vcpu meaningless. I tested your patch in following environment. CPU: Intel Core2 Quad Q9450 Chipset: Intel 82Q35 VM: dom0 (4 vcpus), HVM (4 vcpus) Xen: c/s 19426 HVM: RT priority (1) pass-through devcies PCI graphic board Integrated devices(audio, USB controller) playing video With this configuration, HVM does not work well. When HVM does not have RT priority, HVM works well. I think we would need to consider the relationship between static priority and credit, handling of dom0 and driver domain, and so on. Best regards, Naoki Nishiguchi