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Re: [Qemu-devel] Inquiry, speed comparison on OS X, QEMU vs Virtual PC

From: dguinan
Subject: Re: [Qemu-devel] Inquiry, speed comparison on OS X, QEMU vs Virtual PC
Date: Mon, 5 Jul 2004 17:29:11 -0700

It was precisely because it has not yet been optimized that I was curious of first impressions. The fact that it has been described as "somewhat" slower is encouraging. No one expects it to be faster than VPC out the gate, but to be in the same ballpark is quite an achievement.


On Jul 5, 2004, at 5:23 PM, Leigh Dyer wrote:

On Mon, 2004-07-05 at 15:24 -0700, Daniel J.Guinan wrote:
I'm curious, how does the speed compare to Virtual PC?

Not terribly well yet - on my 1Ghz Tibook, it feels about the same speed
as on my 800Mhz PIII desktop PC at work, which is to say that the
emulated system seems somewhere around high-end-468/low-end-Pentium
speed. However, it's important to remember that Virtual PC:

* has been around for ages, and has seen lots of development and
* uses a hand-written and heavily optimised x86->PPC translator
* uses special PPC features like Altivec and little-endian mode to speed
things up
* uses the host system's MMU to accelerate memory access

Qemu's still fast enough to be usable for a great many things though, so
if you're debating whether or not to try it, by all means download it
and give it a go.


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