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Re: [Xen-devel] [PATCH] Intel/vpmu: Use Intel VPMU quirk on all family 6 processors

On 05/30/2013 12:38 PM, George Dunlap wrote:
On 05/30/2013 05:33 PM, Boris Ostrovsky wrote:
On 05/16/2013 08:30 AM, Jan Beulich wrote:
On 10.05.13 at 11:46, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
On Thu, May 9, 2013 at 9:45 PM, Boris Ostrovsky
<boris.ostrovsky@xxxxxxxxxx> wrote:
On 05/09/2013 04:34 PM, Boris Ostrovsky wrote:
Currently only a few Intel models have VPMU workaround turned on. It
appears, however, that this issue exists on more models than what is
covered by check_pmc_quirk(). Since we don't know exactly which cpus
are affected we should turn this workaround on for all family 6


A few weeks ago we had an email thread about this issue
Did you have a chance to clarify with your HW folks what this is?

We kept hitting this on various models which is why I am suggesting
patch (and I think it should be considered for 4.3).
In principle it's a bug fix, and fine for 4.3.  But it would be good
to get some feedback from someone at Intel.
Intel, anyone???

Thanks, Jan

I haven't seen any responses from Intel folks about this issue.

Do we wait for post-4.3?

Our goals at this point:
- Bug-free release
- Awesome release
- On-time release

I take it that the main risk here is that vcpu for some models which would have otherwise worked will not work anymore?

(I assume you meant vpmu, not vcpu). Yes, that would be the main risk.


But at his point you *know* many models which don't work without it; so on the whole I'm inclined to say that it's an "accept" on the cost/benefits analysis.


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