From: Nuutti Kotivuori <naked@iki.fi>
To: user-mode-linux-devel@lists.sourceforge.net
Cc: user-mode-linux-user@lists.sourceforge.net
Subject: [uml-devel] Re: [uml-user] UML Guests and CPU Performance.
Date: Wed, 03 Nov 2004 14:56:58 +0200 [thread overview]
Message-ID: <87pt2v9jl1.fsf@aka.i.naked.iki.fi> (raw)
In-Reply-To: 417101F4.1050109@fastwebnet.it
primero@fastwebnet.it wrote:
> It seems to me that performance of UML Guest machine is sensibly
> worst then UML Host ... even if there is only one UML guest and no
> other processes sucking resources.
It is definitely worse.
> The Bogomips of the Guest are the half of the Host
Ignore bogomips. Pure CPU workload is really close to the host. You
can try it with any CPU tester application.
> and compiling time is almost the double.
We have generally measured compile time increase by a third or
more. It is affected by many things though, so YMMV. This is with the
skas patch, but without SYSEMU.
> I want to know if this is "Normal" or i have to look for some errors
> in my configuration.
Sounds just about right - for some not-so-independent results on UML
performance compared to other techniques, I found the Xen performance
results to give a rough guideline:
http://www.cl.cam.ac.uk/Research/SRG/netos/xen/performance.html
Do note that the benchmarks they run are really bad on virtualization
techniques - normal user workload suffers far less.
-- Naked
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prev parent reply other threads:[~2004-11-03 14:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-16 11:11 [uml-devel] UML Guests and CPU Performance Primero
2004-11-03 12:56 ` Nuutti Kotivuori [this message]
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