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    SubjectRe: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge
    On 06/08/2012 07:17 AM, Borislav Petkov wrote:
    > On Fri, Jun 08, 2012 at 04:03:38PM +0200, Stephane Eranian wrote:
    >> On Fri, Jun 8, 2012 at 3:59 PM, Peter Zijlstra <peterz@infradead.org> wrote:
    >>> On Fri, 2012-06-08 at 15:51 +0200, Borislav Petkov wrote:
    >>>> Provided, of course, newer microcode versions means a
    >>>> higher version number.
    >>>
    >>> Fair enough, I assumed this.. is this true?
    >>>
    >> I would think so, otherwise it gets even messier!
    >
    > Need to get Intel folk to say something here, hpa?
    >

    There are some exceptions; but it's good enough for this purpose.

    The main exception is that not every revision may be installable on
    every CPU; so you might have 0x20, 0x24, 0x28 on one CPU and 0x22, 0x26,
    0x2a on another; this only requires caution when you set your bracket
    values.

    -hpa

    --
    H. Peter Anvin, Intel Open Source Technology Center
    I work for Intel. I don't speak on their behalf.



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