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xen-devel
Re: [Xen-devel] [PATCH 3/3] tools/xm-test: add cpus parm test in create
* Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> [2006-08-16 10:00]:
> On 16/8/06 3:49 pm, "Ryan Harper" <ryanh@xxxxxxxxxx> wrote:
>
> >>> As long as the first cpu in the mask is available then the affinity
> >>> settings will succeed.
> >>
> >> Really? Xen itself doesn't have such a test (at least not any more) I
> >> believe. Xen ANDs the mask with cpu_online_map and then complains if the
> >> result is empty.
> >
> > Ah, ok. Then they've been working because of the size of the machine
> > I'm on. I'll change the test values such that I have a set for 2, 4,
> > and 8 ensuring that each set doesn't use values that won't be
> > available. I can then run largest set that can run on the host.
>
> Are you *sure* the tests don't just work as they are? I raised the issue as
> a possible problem -- not because I'm certain it's a problem. As I said,
> xend may hide from the user the details of what Xen does to the affinity
> mask. So, have you tried running your new tests on a machine booted with the
> nosmp parameter to Xen (not dom0 -- you want to boot with one physical cpu)?
I tried with maxcpu=1, and that failed to produce the required output as
with only one cpu which prompted me to add the smp check to ensure I had
enough vcpus. I've not tried the nosmp, but I imagine that the
results will be the same. Let me give the current test a run on a
2-way, and I'll give nosmp a try as well. If they fail I'll change the
test values accordingly.
--
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253 T/L: 678-9253
ryanh@xxxxxxxxxx
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