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From: Victor Condino <un1tz3r0@gmail.com>
To: user-mode-linux-devel@lists.sourceforge.net
Cc: Blaisorblade <blaisorblade@yahoo.it>
Subject: Re: [uml-devel] host cpu frequency scaling and guest bogomips
Date: Tue, 12 Jul 2005 12:25:29 -0400	[thread overview]
Message-ID: <42D3EEF9.2020404@gmail.com> (raw)
In-Reply-To: <200507121756.40169.blaisorblade@yahoo.it>

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Blaisorblade wrote:
> Hmm, bogomips are calculated at startup and that won't change easily. However, 
> they become inaccurate in a much wider variety of situation, for instance 
> when there's some load on the host; so, using CONFIG_UML_REAL_TIME_CLOCK 
> (IIRC) uses the host clock for time calculation.
> 
> When you disable this option, I guess that a "sleep 10" when host is at 600, 
> if UML was started at 1800, might last 30 seconds more or less...

hmm... so the moral is, CONFIG_UML_REAL_TIME_CLOCK is a "good thing"(tm)
if your host is going to vary it's core freq?

- - V.C.
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  reply	other threads:[~2005-07-12 16:27 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-07-12  5:26 [uml-devel] host cpu frequency scaling and guest bogomips Victor Condino
2005-07-12 15:56 ` Blaisorblade
2005-07-12 16:25   ` Victor Condino [this message]
2005-07-12 16:35   ` Geert Uytterhoeven
2005-07-12 17:14     ` Blaisorblade

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