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

To: Ryan Harper <ryanh@xxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 3/3] tools/xm-test: add cpus parm test in create bucket
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Wed, 16 Aug 2006 15:58:49 +0100
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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)?
If that doesn't work then, yes, it may need working around like you

 -- Keir

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