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Re: [Qemu-devel] Qemu speed vs vmplayer?

From: Joseph Miller
Subject: Re: [Qemu-devel] Qemu speed vs vmplayer?
Date: Fri, 15 Dec 2006 17:20:33 -0500
User-agent: Thunderbird (X11/20060927)

Paul Brook wrote:
If you're using an accelerator (eg. kqemu or kvm) this is all irelevant
as most code isn't run by qemu, it's virtualized by the accelerator. qemu
just does the IO emulation.

OK, so mmap is not the way to increase some speed.  What needs to be
done to provide a higher Qemu+KQEMU performance, comparable to
VMPlayer?  How does VMPlayer manage to be so much faster than Qemu?  Is
this simply an I/O bottleneck?  How would I go about finding out what
the differences are and how we can improve Qemu+KQEMU performance?

A copy of the kqemu source would be a good start.

I've got a copy of today's CVS, I was just assuming, since this is the qemu-devel mailing list, that someone on the list who regularly works on the qemu code would probably know more about this than I do. I have some assembly background, and I'm not afraid to start digging into x86 cpu internals, but I would like a starting point. I'm really trying to figure out something specific about qemu. When running Qemu+KQEMU for linux-x86 host on WinXP x86 guest, top shows that 70% or more of my cpu is being use in the system portion. When using vmplayer (free), top shows less than 5% of my cpu in the system portion. vmplayer seems to be a LOT faster than Qemu, however I would prefer to use Qemu. I have a P4 2.6GHz host system with 1.5G RAM and 512MB RAM allocated to my guest OS's. Does anyone know the reason behind the slowdown? Is anyone familiar with what Qemu is so busy doing whilst sitting idle? I should note that I have compiled the KQemu into my 2.6 kernel instead of loading it as a module. I have found better performance with it this way. Any insight from a developer would be most appreciated.


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