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From: Paolo Bonzini <pbonzini@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: [PATCH kvm-unit-tests] pmu: fixes for Sandy Bridge hosts
Date: Mon, 03 Jun 2013 09:44:08 +0200	[thread overview]
Message-ID: <51AC4948.8050605@redhat.com> (raw)
In-Reply-To: <20130603073850.GX4725@redhat.com>

Il 03/06/2013 09:38, Gleb Natapov ha scritto:
>> > Turbo boost could also contribute to lowering the number of cycles; a
>> > boosted processor has ref cpu cycles that are _longer_ than the regular
>> > cycles (thus they count in smaller numbers).  Maybe that's why "core
>> > cycles" didn't go below N.
>> > 
> "core cycles" are subject to Turbo boost changes, not ref cycles. Since
> instruction are executed at core frequency ref cpu cycles count may be
> indeed smaller.

Yes, that's what I was trying to say. :)

Paolo


      reply	other threads:[~2013-06-03  7:44 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-30 17:43 [PATCH kvm-unit-tests] pmu: fixes for Sandy Bridge hosts Paolo Bonzini
2013-05-30 17:43 ` [PATCH] " Paolo Bonzini
2013-05-30 17:45   ` Paolo Bonzini
2013-06-02 15:32 ` [PATCH kvm-unit-tests] " Gleb Natapov
2013-06-03  6:33   ` Paolo Bonzini
2013-06-03  6:38     ` Gleb Natapov
2013-06-03  7:08       ` Paolo Bonzini
2013-06-03  7:38         ` Gleb Natapov
2013-06-03  7:44           ` Paolo Bonzini [this message]

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