Re: [Xen-devel] Strange interdependace between domains

[Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>]

On 20.02.2014 19:22, Dario Faggioli wrote:
> On gio, 2014-02-20 at 07:07 +0100, Juergen Gross wrote:
> > On 18.02.2014 19:06, Dario Faggioli wrote:
> > > 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).
> > 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.
> All true... To the point that I know also wonder what a suitable
> interface and a not too verbose output configuration could be...
Well, looking at the available topology information I think it should look like
the following example:

# xl cpupool-list --shareinfo
Name          CPUs   Sched     Active  Domain count  shared resources
Pool-0          1    credit       y         1        core:   lw_pool
lw_pool         1    credit       y         0        core:   Pool-0
bs2_pool        2    credit       y         1        socket: Pool-0,lw_pool

What do you think?

> > 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.
> Indeed. I actually have an half backed series doing right that. It's a
> bit more complicated (still from an interface point of view), as that
> info resides in Xen, and some new hcall or similar is required to
> retrieve that.
>
> I'll post it in early 4.5 dev cycle.
Please do!


Juergen

--
Juergen Gross                 Principal Developer Operating Systems
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