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Re: [Qemu-devel] qemu-fast target removal ?
From: |
Herbert Poetzl |
Subject: |
Re: [Qemu-devel] qemu-fast target removal ? |
Date: |
Sun, 30 Jan 2005 21:46:19 +0100 |
User-agent: |
Mutt/1.4.1i |
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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