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[Xen-devel] Xen 4.1 interrupts not delievered.

To: bruce.edge@xxxxxxxxx, Ray.Lin@xxxxxxx, linux@xxxxxxxxxxxxxx, caker@xxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, keir@xxxxxxx, Ian.Campbell@xxxxxxxxxxxxx, m.a.young@xxxxxxxxxxxx, jeremy@xxxxxxxx, pasik@xxxxxx
Subject: [Xen-devel] Xen 4.1 interrupts not delievered.
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Tue, 12 Oct 2010 13:17:45 -0400
Delivery-date: Tue, 12 Oct 2010 10:20:07 -0700
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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:
 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?

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