From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: xen-devel@lists.xensource.com,
Valtteri Kiviniemi <valtteri.kiviniemi@dataproof.fi>,
Keir Fraser <keir.fraser@eu.citrix.com>
Subject: Re: Latest unstable detects cpu speed incorrectly
Date: Tue, 27 Oct 2009 15:31:45 -0700 [thread overview]
Message-ID: <4AE774D1.2080907@goop.org> (raw)
In-Reply-To: <09ba61b1-d916-482c-ad37-1433375f9d87@default>
On 10/27/09 15:15, Dan Magenheimer wrote:
> The downside is
> of course is that the extra multiply would need to be
> done on every emulated TSC (unless maybe it could be folded
> into the other required scaling?)
>
Given the speed of multipliers compared to everything else on the
emulation path, I don't think it would be measurable let alone
noticeable (my measurements show that multiply is trivial compared to a
native rdtsc).
The nice thing about a fixed 1GHz emulated tsc is that it makes it clear
that it is emulated.
J
prev parent reply other threads:[~2009-10-27 22:31 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-27 15:22 Latest unstable detects cpu speed incorrectly Valtteri Kiviniemi
2009-10-27 15:27 ` Pasi Kärkkäinen
2009-10-27 15:28 ` Keir Fraser
2009-10-27 15:48 ` Valtteri Kiviniemi
2009-10-27 15:51 ` Valtteri Kiviniemi
2009-10-27 16:05 ` Keir Fraser
2009-10-27 16:12 ` Valtteri Kiviniemi
2009-10-27 16:14 ` Valtteri Kiviniemi
2009-10-27 16:15 ` Valtteri Kiviniemi
2009-10-27 16:27 ` Keir Fraser
2009-10-27 16:32 ` Valtteri Kiviniemi
2009-10-27 16:34 ` Valtteri Kiviniemi
2009-10-27 16:36 ` Valtteri Kiviniemi
2009-10-27 19:46 ` Jeremy Fitzhardinge
2009-10-27 19:48 ` Jeremy Fitzhardinge
2009-10-27 21:39 ` Valtteri Kiviniemi
2009-10-27 21:40 ` Valtteri Kiviniemi
2009-10-27 16:47 ` Keir Fraser
2009-10-27 17:20 ` Mr. Teo En Ming (Zhang Enming)
2009-10-27 17:23 ` Keir Fraser
2009-10-27 17:25 ` Mr. Teo En Ming (Zhang Enming)
[not found] ` <C70CDFC0.18949%keir.fraser@eu.citrix.com>
2009-10-27 18:22 ` Mr. Teo En Ming (Zhang Enming)
2009-10-27 18:40 ` Keir Fraser
2009-10-27 18:47 ` Mr. Teo En Ming (Zhang Enming)
2009-10-27 18:56 ` Keir Fraser
2009-10-27 18:59 ` Mr. Teo En Ming (Zhang Enming)
2009-10-27 16:18 ` Mr. Teo En Ming (Zhang Enming)
2009-10-27 16:26 ` Mr. Teo En Ming (Zhang Enming)
2009-10-27 19:41 ` Jeremy Fitzhardinge
2009-10-27 16:02 ` Keir Fraser
2009-10-27 22:15 ` Dan Magenheimer
2009-10-27 22:31 ` Jeremy Fitzhardinge [this message]
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