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Re: [Xen-devel] [PATCH 3/3] tools/xm-test: add cpus parm test in create

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 3/3] tools/xm-test: add cpus parm test in create bucket
From: Ryan Harper <ryanh@xxxxxxxxxx>
Date: Wed, 16 Aug 2006 10:07:53 -0500
Cc: Ryan Harper <ryanh@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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* 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

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