From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir@xen.org>
Subject: Re: [PATCH] svm: Do not intercept RDTCS(P) when TSC
 scaling is supported by hardware
Date: Wed, 25 Apr 2012 18:14:49 +0100
Message-ID: <CBBDEF99.3EECC%keir@xen.org>
References: <4F982098.8070003@amd.com>
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To: wei.huang2@amd.com, Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@amd.com>, Jan Beulich <JBeulich@suse.com>, xen-devel <xen-devel@lists.xen.org>
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On 25/04/2012 17:04, "Wei Huang" <wei.huang2@amd.com> wrote:

>> I certainly don't feel comfortable ACKing it.  I'd like
>> to see some testing that demonstrates the patch either improves
>> functionality or performance without breaking other things.
>> But if nobody else shares my concern, I don't feel that
>> I have the right to block it either.
> 
> We can provide some rdtsc performance numbers. Regarding functionality,
> it is relatively hard to prove unless Dan has some more specific ideas
> of testing it. I think the hardware rdtsc scaling is inline with
> software-based emulated approach.

I've put it in to xen-unstable. I'm not sure about putting into 4.1 for the
forthcoming release from that branch.

 -- Keir