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Re: [Qemu-devel] -kernel-kqemu

From: Fabrice Bellard
Subject: Re: [Qemu-devel] -kernel-kqemu
Date: Tue, 25 Apr 2006 00:31:10 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20040913


I just found the problem related to the -kernel-kqemu bug with win2k and '-m 256'. But fixing the bug is another matter !


Brad Campbell wrote:
Troy Benjegerdes wrote:

On Thu, Feb 09, 2006 at 04:01:34PM -0600, Anthony Liguori wrote:

Jim C. Brown wrote:

-kernel-kqemu virtualizes ring 0 code.

So it basically makes qemu do what VMware does.

IIRC someone reported a 33% speedup with the new option.

That was me. That was a 33% speedup on win2k startup time. kqemu (user only) has a negligible impact on win2k startup time which suggests this is mostly ring 0 code running which would make it a good benchmark for kernel-kqemu performance.

This was a terribly unscientific benchmarking so don't read too much into it.


Anthony Liguori

My win2k guest (with SP4, but not any updates) seemed to hang on startup
with -kernel-kqemu.

Are you using -m 256 by any chance? I get this result with around that much ram allocated to the guest. -m 160 (or less) or -m 384 (or more) works perfectly here..

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