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Re: [Xen-devel] Strange interdependace between domains

  • To: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
  • From: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
  • Date: Thu, 20 Feb 2014 07:07:44 +0100
  • Cc: Ian Campbell <Ian.Campbell@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Don Slutz <dslutz@xxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx, Simon Martin <furryfuttock@xxxxxxxxx>, Nate Studer <nate.studer@xxxxxxxxxxxxxxx>
  • Delivery-date: Thu, 20 Feb 2014 06:07:55 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

On 18.02.2014 19:06, Dario Faggioli wrote:
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

Change to something like:

Pool-0             0,1,2 (and part of 3)

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:

Warning: cpupool's share hyperthreaded cpus.

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.


Adding some information like this would be nice, indeed. But I think we should
not limit this to just hyperthreads. There are more levels of shared resources,
like caches or memory interfaces on the same socket. In case we want to add
information about potential performance influences due to shared resources, we
should be more generic.

And what about some NUMA information? Wouldn't it be worthwhile to show memory
locality information as well? This should be considered to be displayed by
"xl list", too.


Juergen Gross                 Principal Developer Operating Systems
PBG PDG ES&S SWE OS6                   Telephone: +49 (0) 89 62060 2932
Fujitsu                                   e-mail: juergen.gross@xxxxxxxxxxxxxx
Mies-van-der-Rohe-Str. 8                Internet: ts.fujitsu.com
D-80807 Muenchen                 Company details: ts.fujitsu.com/imprint.html

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