Messages in this thread | | | Subject | Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge | From | Peter Zijlstra <> | Date | Tue, 12 Jun 2012 19:18:13 +0200 |
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On Tue, 2012-06-12 at 19:17 +0200, Borislav Petkov wrote: > On Tue, Jun 12, 2012 at 07:13:23PM +0200, Peter Zijlstra wrote: > > > That's what I had in my original version. > > > > Right, but you really need to check all cpus, not just the one you > > happen to run on or the boot cpu. > > Ok, the answer to that question is whether sandybridge can support mixed > ucode revisions or not. If not, you only need to check the current cpu > you're on.
But the ucode loader can be (ab)used to only update one of the many CPUs.
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