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

[Elena Ufimtseva <ufimtseva@xxxxxxxxx>]

On Sun, Dec 1, 2013 at 3:03 AM, Dario Faggioli
<dario.faggioli@xxxxxxxxxx> wrote:
> On dom, 2013-12-01 at 01:03 -0500, Elena Ufimtseva wrote:
>> Hi
>>
>> pv kernel crashes when starting guest with vcpus above 150 with latest
>> linux kernel.
>>
> Wow... >150 vcpus for a single guest? What is it that you are up to
> here?!? :-P :-P

Was experimenting with 150 nodes :P

>
>> WIth increase of max_event_channel it boots (I tried
>> 4096).
>>
> I don't remember the exact numbers. This:
> http://wiki.xenproject.org/wiki/Xen_4.3_Feature_List#Performance_and_Scalability_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=uz52hxKbv5I
> http://www.slideshare.net/xen_com_mgr/jonathandavies-xenservervmdensity20131024-1

Yes, I wanted to see if it should behave this way.

>
> Dario
>
> --
> <<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)
>



-- 
Elena

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