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    SubjectRe: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge
    On Tue, Jun 12, 2012 at 01:58:23PM -0700, H. Peter Anvin wrote:
    > There is a difference here. Mixed steppings or even mixed CPUs are,
    > indeed, supported (even things like Nehalem + Westmere in the same
    > system). However, the notion is that we should upload the *entire set*
    > of microcodes to the kernel, and let it flash the appropriate one into
    > each CPU.

    Sure, the ucode driver both on Intel and AMD does that already by
    looking at each patch in the blob. I'd expect no change to that
    functionality.

    > This may result in different version number on different CPUs.

    Ok, understood.

    Thanks.

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    Boris.

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