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
prev parent 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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