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qemu -kernel-kqemu

From: Samuel Thibault
Subject: qemu -kernel-kqemu
Date: Sat, 26 Apr 2008 02:16:12 +0100
User-agent: Mutt/1.5.12-2006-07-14


Some people have reported having troubles with kqemu.  Actually, they
are not having problems with user kqemu, but kernel kqemu.  With just
modprobe kqemu and no -kernel-kqemu, one gets kqemu acceleration in
guest's user mode and that works plain fine.  -kernel-kqemu enables
acceleration for the guest's kernel, but as explained in the technical
documentation, that can not work for all guest systems, because kqemu
has limitations.  I've identified the problem that Mach has, see the
my qemu-devel mailing list post.  I've put a fixed gnumach on


if people want to give it a try.

Yes, the EATA probing loop takes some time.  This is because with
-kernel-kqemu, the udelay calibration loop gets completely wrong and
thus udelay() loops much more than needed.

That being said, people may want to perform real tests, but I doubt
-kernel-kqemu will provide a lot of speedup compared to juste modprobe
kqemu: GNU/Hurd spends most of its time in userland in servers ;)


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