Re: [Qemu-devel] qemu-fast target removal ?

[Herbert Poetzl]

On Sat, Jan 29, 2005 at 10:48:24PM +0100, Fabrice Bellard wrote:
> Hi,
> 
> I plan to remove the 'qemu-fast' target in the next release of QEMU. It 
> is too painful to maintain, difficult to port and it needs a patched 
> guest OS to work correctly.

hmm, but IMHO it's _a_lot_ faster than the qemu/soft mmu
and I'm using it on a regular basis for kernel development
(the patch is minimal and doesn't change anything relevant)

are you sure that you want to do that?

here is a comparison:
(2.6.11-rc2 kernel testboot, nothing else)

with qemu-fast (0.6.1):

 3.31user 0.33system 0:08.39elapsed 43%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (5638major+1879minor)pagefaults 0swaps

with qemu (softmmu, 0.6.1)

19.25user 0.27system 0:23.25elapsed 83%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (901major+5788minor)pagefaults 0swaps

I would _really_ appreciate not to spend almost
three times the amount of time and a lot more
of cpu power to wait for the kernel to boot ...

> This target is replaced by the standard QEMU with soft mmu support. The 
> QEMU Kernel Acceleration Layer which will be unveiled very soon will 
> give much more performance while working with unpatched guest OSes.

any numbers for that? will it be compareable?
what will it require?

thanks for your work!

best,
Herbert

> Fabrice.
> 
> 
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