From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.xen@gmail.com>
Subject: Re: Using debug-key 'o:  Dump IOMMU p2m table,
 locks up machine
Date: Tue, 04 Sep 2012 08:01:54 +0100
Message-ID: <CC6B65F2.3DAAF%keir.xen@gmail.com>
References: <1576173912.20120904085238@eikelenboom.it>
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To: Sander Eikelenboom <linux@eikelenboom.it>, Jan Beulich <JBeulich@suse.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>, wei.wang2@amd.com, Santosh Jodh <santosh.jodh@citrix.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
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On 04/09/2012 07:52, "Sander Eikelenboom" <linux@eikelenboom.it> wrote:

>> Isn't that because tasklets (i.e. idle vCPU-s with tasklets active)
>> get preferred in the schedulers? Some compensation might be
>> needed for the penalized vCPU, at least if that one is pinned
>> (not sure whether load balancing would be able to steal the
>> head of the run queue from a remote CPU). Sander - are you
>> by chance pinning Dom0 vCPU-s? And how many of them does
>> your Dom0 have?
>
> Yes i do, could perhaps be the pinning of CPU0 ?

Yeah. :) Case closed?