From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <dario.faggioli@citrix.com>
Subject: Re: pv kernel panic xen 4.4 unstable with large number
 of vcpus and default max_event_channel
Date: Sun, 1 Dec 2013 09:03:15 +0100
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To: Elena Ufimtseva <ufimtseva@gmail.com>
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On dom, 2013-12-01 at 01:03 -0500, Elena Ufimtseva wrote:
> Hi
>=20
> pv kernel crashes when starting guest with vcpus above 150 with latest
> linux kernel.=20
>
Wow... >150 vcpus for a single guest? What is it that you are up to
here?!? :-P :-P

> WIth increase of max_event_channel it boots (I tried
> 4096).
>=20
I don't remember the exact numbers. This:
http://wiki.xenproject.org/wiki/Xen_4.3_Feature_List#Performance_and_Scalab=
ility_Enhancements
says you should be able to reach 750 vcpus, but it's probably
_in_total_, not necessarily within a single guest.

Also, these talks should have some numbers (although the latter is about
XenServer), but again, it's mostly about total number, I think:
http://www.youtube.com/watch?v=3Duz52hxKbv5I
http://www.slideshare.net/xen_com_mgr/jonathandavies-xenservervmdensity2013=
1024-1

Dario

--=20
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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