From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Xen 4.1 interrupts not delievered. Date: Tue, 12 Oct 2010 13:17:45 -0400 Message-ID: <20101012171745.GA27232@dumpdata.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: bruce.edge@gmail.com, Ray.Lin@lsi.com, linux@eikelenboom.it, caker@theshore.net, xen-devel@lists.xensource.com, keir@xen.org, Ian.Campbell@eu.citrix.com, m.a.young@durham.ac.uk, jeremy List-Id: xen-devel@lists.xenproject.org Hey folks, The last month there was a flurry of emails about PCI passthrough devices and some that in which a high load is put on machine and interrupts are not being delivered (to Dom0 it looks that way) - and even the cases where there are no PCI passthrough enabled. Three things that pop up is that: 1). Xen 3.4.4-rc1-pre does not have this problem (this is Mr. Christopher email about 3Ware 9690SA). 2). Moving all Domains from physical cpu 0 makes the problem go away (this is Mr. Sander email about High cpu load for events/0). 3). No fixes yet. A couple of that might fix the problems are: 1). Ian's fix to the event channels: http://xenbits.xen.org/gitweb?p=people/ianc/linux-2.6.git;a=commit;h=5d30cb2a85912ffb5f6556d55472c26801eef2ea 2). Disable IRQ balancing in Xen (and also in Linux kernel). "noirqbalance" 3). Pin domains, but nothing to Domain 0. But it might be worth trying them out?