Messages in this thread | | | Date | Thu, 5 Jun 2014 17:17:34 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH 9/9] perf/x86: add syfs entry to disable HT bug workaround |
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On Thu, Jun 05, 2014 at 05:45:24PM +0300, Maria Dimakopoulou wrote: > The issue is that the outcoming leaked counts are not compensated > by the incoming leaked counts of the sibling thread. With the workaround, > corrupting events are always scheduled with an empty sibling counter. > This means that their leaked counts are lost. So it is expected to see > lower counts with the workaround. Note that this is not a side-effect of > the workaround; leaked counts are expected to be lost with nothing > measured on the sibling counter in general. > > In a second series we intend to re-integrate the counts for counting mode > events. The workaround makes this easier because it guarantees > that the sibling counter is unused, thus its counts are purely leaked > counts and they can be safely re-integrated.
IIUC, sounds to me like reintegrating the leaked counts from the unused counter should be part of the workaround too, not a second series...
-- Regards/Gruss, Boris.
Sent from a fat crate under my desk. Formatting is fine. --
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