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Re: [kvm-devel] Performance overhead of get_cycles_sync

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To: Ingo Molnar <mingo@...>
Cc: Andi Kleen <ak@...>, <dor.laor@...>, kvm-devel <kvm-devel@...>, Linux Kernel Mailing List <linux-kernel@...>
Date: Tuesday, December 11, 2007 - 5:26 pm

On Tue, Dec 11, 2007 at 03:27:17PM +0100, Ingo Molnar wrote:

I don't think this is a good idea. I discussed exactly this item with
Andi Kleen a while ago and afair the serializing instruction was
necessary to fix a backwards walking gettimeofday() on some K8
revisions. Andi Kleen can tell more details, I added him to the CC list.

Joerg

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Messages in current thread:
Re: Performance overhead of get_cycles_sync, Ingo Molnar, (Tue Dec 11, 10:27 am)
Re: [kvm-devel] Performance overhead of get_cycles_sync, Joerg Roedel, (Tue Dec 11, 5:26 pm)
Re: Performance overhead of get_cycles_sync, Arjan van de Ven, (Tue Dec 11, 12:35 pm)
Re: Performance overhead of get_cycles_sync, Ingo Molnar, (Tue Dec 11, 1:03 pm)
Re: Performance overhead of get_cycles_sync, Andi Kleen, (Tue Dec 11, 1:23 pm)
Re: Performance overhead of get_cycles_sync, Ingo Molnar, (Tue Dec 11, 4:19 pm)
Re: Performance overhead of get_cycles_sync, Ingo Molnar, (Tue Dec 11, 4:29 pm)
Re: Performance overhead of get_cycles_sync, Dor Laor, (Tue Dec 11, 11:03 am)
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