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Re: [Xen-devel] pv kernel panic xen 4.4 unstable with large number of vcpus and default max_event_channel

To: Elena Ufimtseva <ufimtseva@xxxxxxxxx>
From: David Vrabel <david.vrabel@xxxxxxxxxx>
Date: Mon, 2 Dec 2013 17:06:39 +0000
Cc: "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>
Delivery-date: Mon, 02 Dec 2013 17:06:53 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On 01/12/13 06:03, Elena Ufimtseva wrote:
> Hi
> 
> pv kernel crashes when starting guest with vcpus above 150 with latest
> linux kernel. WIth increase of max_event_channel it boots (I tried
> 4096).

The default for max_event_channels is 1023 which should be enough for a
typical guest. 150 VCPUs is very much not a typical guest.

We'll need to be sure to include a release note on this for the 4.4 release.

David

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References:
- [Xen-devel] pv kernel panic xen 4.4 unstable with large number of vcpus and default max_event_channel
  - From: Elena Ufimtseva

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