From: Keir Fraser <keir.fraser@eu.citrix.com>
To: Dan Magenheimer <dan.magenheimer@oracle.com>,
"Xen-Devel (xen-devel@lists.xensource.com)"
<xen-devel@lists.xensource.com>,
Ian Pratt <Ian.Pratt@eu.citrix.com>
Subject: Re: [RFC] Physical hot-add cpus and TSC
Date: Wed, 26 May 2010 18:51:45 +0100 [thread overview]
Message-ID: <C8231E41.15F1A%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <64b09ca3-fb6e-4c06-907d-94560aab2420@default>
On 26/05/2010 18:39, "Dan Magenheimer" <dan.magenheimer@oracle.com> wrote:
>> But what we do in 4.0 is whack all the TSCs at boot time... How is this
>> any different?
>
> I don't think we do that anymore, at least not when the
> underlying machine is deemed to have a stable TSC
> (Invariant TSC or constant/nonstop TSC with max_cstate<3).
Hm, yep, looks like we skip it when we detect 'reliable tscs'. So on modern
x86 that means we do not modify TSCs in Xen ever.
-- Keir
next prev parent reply other threads:[~2010-05-26 17:51 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-26 15:19 [RFC] Physical hot-add cpus and TSC Dan Magenheimer
2010-05-26 15:45 ` Keir Fraser
2010-05-26 16:44 ` Dan Magenheimer
2010-05-26 17:02 ` Ian Pratt
2010-05-26 17:29 ` Keir Fraser
2010-05-26 17:39 ` Dan Magenheimer
2010-05-26 17:51 ` Keir Fraser [this message]
2010-05-26 18:01 ` Keir Fraser
2010-05-26 19:46 ` Dan Magenheimer
2010-05-26 21:26 ` Keir Fraser
2010-05-27 6:15 ` Jiang, Yunhong
2010-05-27 6:57 ` Keir Fraser
2010-05-27 7:09 ` Jiang, Yunhong
2010-05-27 7:15 ` Jiang, Yunhong
2010-05-27 19:55 ` Dan Magenheimer
2010-05-27 8:44 ` Keir Fraser
2010-05-27 9:31 ` Jiang, Yunhong
2010-05-27 15:08 ` Dan Magenheimer
2010-05-28 5:39 ` Jiang, Yunhong
2010-05-28 5:47 ` Keir Fraser
2010-05-28 6:29 ` Jiang, Yunhong
2010-05-28 7:03 ` Keir Fraser
2010-05-28 14:35 ` Dan Magenheimer
2010-05-28 15:33 ` Jiang, Yunhong
2010-05-28 16:25 ` Dan Magenheimer
2010-05-31 8:56 ` Jiang, Yunhong
2010-05-28 16:08 ` Keir Fraser
2010-05-28 16:36 ` Dan Magenheimer
2010-05-28 17:19 ` Keir Fraser
2010-05-28 14:52 ` Dan Magenheimer
2010-05-28 15:05 ` Jiang, Yunhong
2010-05-28 20:24 ` Dan Magenheimer
2010-05-31 7:54 ` Jiang, Yunhong
2010-06-01 0:30 ` Dan Magenheimer
2010-06-01 1:40 ` Jiang, Yunhong
2010-06-01 17:07 ` Jeremy Fitzhardinge
2010-06-02 9:17 ` Jiang, Yunhong
2010-06-10 6:55 ` Dong, Eddie
2010-06-10 13:15 ` Dan Magenheimer
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