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Re: [Qemu-devel] softmmu thoughts
From: |
Piotras |
Subject: |
Re: [Qemu-devel] softmmu thoughts |
Date: |
Tue, 14 Dec 2004 18:54:04 +0100 |
Hi!
I'm attaching a new patch based on your suggestions. On my machine
nbench gives:
memory index: 37% up
integer index: 36% up
fp index: 4% up
The patch is divided in three files to simplify review. Part 1 contains
mostly rearrangement existing code necessary for the patch. Part 2
adds the new mmu mode. Part 3 contains heuristic to optimize
performance of iomem and self modifying code.
To test the patch create a build directory and run:
> tar -zxf _PATH_TO_qemu-0.6.1.tar.gz
> tar -zxf _PATH_TO_linux-test-0.5.1.tar.gz
> cd qemu-0.6.1
> ./configure --target-list=i386-softmmu
> gunzip < _PATH_TO_mmu-part1.patch.gz | patch -p1
> gunzip < _PATH_TO_mmu-part2.patch.gz | patch -p1
> gunzip < _PATH_TO_mmu-part3.patch.gz | patch -p1
> make
> ./i386-softmmu/qemu -m 64 -L pc-bios -hda ../linux-test/linux.img
Last but not least. I'd like to acknowledge Magnus contribution -- VM
setup code is derived from his work.
Regards,
Piotrek
On Wed, 20 Oct 2004 14:41:42 +0200, Fabrice Bellard <address@hidden> wrote:
> Hi,
>
> The idea is interesting. Here are several suggestions:
>
> - It would be more efficient and simpler to map one 4KB host memory page
> every 8 KB. Then you can have a fixed mmap() mapping (no syscall
> overhead to change the mappings) and a simple way to handle unaligned
> accesses.
> - The critical point would be to keep standard soft MMU accesses for
> device access. An architectural change is needed to do that, but it
> seems easy to add.
> - This patch should work with qemu, not qemu-fast. The future of
> qemu-fast is to use a kernel module to have near native performances. It
> is not worthwhile to invest time in soft MMU or dynamic translation when
> you can just execute the code as is !
>
> Fabrice.
mmu-part1.patch.gz
Description: Unix tar archive
mmu-part2.patch.gz
Description: Unix tar archive
mmu-part3.patch.gz
Description: Unix tar archive
- Re: [Qemu-devel] softmmu thoughts,
Piotras <=