Re: [Xen-devel] [PATCH] x86: don't write_tsc() non-zero values o

xen-devel

Re: [Xen-devel] [PATCH] x86: don't write_tsc() non-zero values on CPUs u

To:	Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>
Subject:	Re: [Xen-devel] [PATCH] x86: don't write_tsc() non-zero values on CPUs updating only the lower 32 bits
From:	Keir Fraser <keir.xen@xxxxxxxxx>
Date:	Fri, 15 Apr 2011 07:40:00 +0100
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx, "winston.l.wang" <winston.l.wang@xxxxxxxxx>
Delivery-date:	Thu, 14 Apr 2011 23:40:57 -0700
Dkim-signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:user-agent:date:subject:from:to:cc:message-id :thread-topic:thread-index:in-reply-to:mime-version:content-type :content-transfer-encoding; bh=iNfCJ+t7WY4TqfPtHXj8WZPirl2NhJA+NW4reimQNnA=; b=QR+/O/nq3Nd2jAhRYdT2l2j7gw7h7lC3iUhvIBgGFgyBrnuSFa037NbsLGJ2S4567o n5jQlB+Ni172VyoSlTTf1NPexhExC/paYs0ZKciLjPY2NHhXzfR1TmihM0DcAd/ACukO 6QuL1zI6U56y8ZHMf4GRw3Z9Lj2hhYGKxJs6Y=
Domainkey-signature:	a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=user-agent:date:subject:from:to:cc:message-id:thread-topic :thread-index:in-reply-to:mime-version:content-type :content-transfer-encoding; b=pPk/IZuixqrpomMGcRb4HYf4Mhyo2V5amXncc3NfE9zHn6Wc3yY0jSBVhjm/k2J16B iApzb5W9w78dtf4JFLgkub3+eZ+31PYvsq9/5lu4XfYGPDRFCcRT4ZnNeAvOnGyR87LW 3MYTpyeW2VsWEcsF7li/sEXgGCb6IrSnz2wnc=
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to:	<7a5514b0-b3d6-478a-9434-b80758a7445d@default>
List-help:	<mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id:	Xen developer discussion <xen-devel.lists.xensource.com>
List-post:	<mailto:xen-devel@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender:	xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index:	Acv7N/FIlU2XI/RwPEmicQ0VEud++A==
Thread-topic:	[Xen-devel] [PATCH] x86: don't write_tsc() non-zero values on CPUs updating only the lower 32 bits
User-agent:	Microsoft-Entourage/12.28.0.101117

On 14/04/2011 23:41, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

>> Yeah, if we want to continue to try avoiding write_tsc() on
>> TSC_RELIABLE
>> then we should assert !TSC_RELIABLE on the write_tsc() path in
>> cstate_tsc_restore().
> 
> Agreed.  In fact, maybe it should be asserted in write_tsc?

We still write_tsc on CPU physical hot-add.

 -- Keir



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread]

Current Thread

[Next in Thread>

Previous by Date:

[Xen-devel] [xen-unstable test] 6840: tolerable FAIL, xen . org

Next by Date:

Re: [Xen-devel] [PATCH] x86: don't write_tsc() non-zero values on CPUs updating only the lower 32 bits, Jan Beulich

Previous by Thread:

RE: [Xen-devel] [PATCH] x86: don't write_tsc() non-zero values on CPUs updating only the lower 32 bits, Dan Magenheimer

Next by Thread:

RE: [Xen-devel] [PATCH] x86: don't write_tsc() non-zero values on CPUs updating only the lower 32 bits, Dan Magenheimer

Indexes:

[Date] [Thread] [Top] [All Lists]

WARNING - OLD ARCHIVES

xen-devel

Re: [Xen-devel] [PATCH] x86: don't write_tsc() non-zero values on CPUs u