From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <dario.faggioli@citrix.com>
Subject: Re: Strange interdependace between domains
Date: Tue, 18 Feb 2014 19:06:21 +0100
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To: Don Slutz <dslutz@verizon.com>
Cc: Ian Campbell <Ian.Campbell@citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Juergen Gross <juergen.gross@ts.fujitsu.com>, xen-devel@lists.xen.org, Simon Martin <furryfuttock@gmail.com>, Nate Studer <nate.studer@dornerworks.com>
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On mar, 2014-02-18 at 12:58 -0500, Don Slutz wrote:
> >> root@smartin-xen:~# xl cpupool-list -c
> >> Name               CPU list
> >> Pool-0             0,1,2
>=20
> Change to something like:
>=20
>=20
> Pool-0             0,1,2 (and part of 3)
>=20
This would be cool, and I personally would be all for it... but it
perhaps will not be that clear at pointing the user to think to
hyperthreading. :-P

> Or add:
>=20
> Warning: cpupool's share hyperthreaded cpus.
>=20
While this one, although a bit more "boring" than the above, would
probably be something quite valuable to have!

I can only think of rather expensive ways of implementing it, involving
going through all the cpupools and, for each cpupool, through all its
cpus and check the topology relationships, but perhaps there are others
(I'll think harder).

Also, we are certainly not talking about hot paths.

Juergen?

Regards,
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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