From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: "Xen-Devel (E-mail)" <xen-devel@lists.xensource.com>,
Keir Fraser <keir.fraser@eu.citrix.com>
Subject: Re: [PATCH] replace rdtsc emulation-vs-native xen boot option with per-domain (hypervisor part)
Date: Mon, 28 Sep 2009 16:10:05 -0700 [thread overview]
Message-ID: <4AC1424D.8070008@goop.org> (raw)
In-Reply-To: <7e5859b0-457b-4788-b8c6-6cc3d143bae2@default>
On 09/28/09 15:43, Dan Magenheimer wrote:
> PV ones too. An app doesn't have any idea (and doesn't
> and shouldn't care) if it is running on a PV or HVM domain.
>
Well, it shouldn't be enabled by default. That slows down all rdtsc
operations for the benefit of very niche applications. The Xen
clocksource assumes that rdtsc is fast, unemulated and in need of
correction.
If someone really needs an artificial tsc, then they can enable the
option for themselves.
J
next prev parent reply other threads:[~2009-09-28 23:10 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-27 19:22 [PATCH] replace rdtsc emulation-vs-native xen boot option with per-domain (hypervisor part) Dan Magenheimer
2009-09-27 21:39 ` Keir Fraser
2009-09-27 23:19 ` Dan Magenheimer
2009-09-28 7:25 ` Keir Fraser
2009-09-28 9:04 ` Keir Fraser
2009-09-28 15:48 ` Dan Magenheimer
2009-09-28 16:07 ` Keir Fraser
2009-09-28 16:24 ` Dan Magenheimer
2009-09-28 19:44 ` Dan Magenheimer
2009-09-28 20:55 ` Keir Fraser
2009-09-28 8:22 ` Zhang, Xiantao
2009-09-28 15:13 ` Dan Magenheimer
2009-09-28 22:24 ` Jeremy Fitzhardinge
2009-09-28 22:43 ` Dan Magenheimer
2009-09-28 23:10 ` Jeremy Fitzhardinge [this message]
2009-09-28 23:36 ` Dan Magenheimer
2009-09-29 0:27 ` Ian Pratt
2009-09-29 1:42 ` Zhang, Xiantao
2009-09-29 3:13 ` Dan Magenheimer
2009-09-29 17:24 ` Jeremy Fitzhardinge
2009-09-29 16:44 ` Jeremy Fitzhardinge
2009-09-29 17:34 ` Dan Magenheimer
2009-09-29 19:01 ` Jeremy Fitzhardinge
2009-09-29 23:45 ` Dan Magenheimer
2009-09-30 0:41 ` Jeremy Fitzhardinge
2009-10-05 23:15 ` Jeremy Fitzhardinge
2009-10-05 23:42 ` Dan Magenheimer
2009-10-06 0:20 ` Jeremy Fitzhardinge
2009-10-06 1:43 ` Dan Magenheimer
2009-10-06 4:56 ` Jeremy Fitzhardinge
2009-10-06 7:07 ` Keir Fraser
2009-10-06 9:09 ` Keir Fraser
2009-10-06 13:49 ` Dan Magenheimer
2009-10-06 13:59 ` Keir Fraser
2009-10-08 23:35 ` Dan Magenheimer
2009-11-05 17:08 ` Dan Magenheimer
2009-11-06 7:01 ` Keir Fraser
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