Re: [Qemu-devel] QEMU with KNOPPIX

[Kuniyasu Suzaki]

 >>From: Piotr Krysik <address@hidden>
 >>Subject: Re: [Qemu-devel] QEMU with KNOPPIX
 >>
 >>Hi,
 >>
 >>Probably a lot of CPU is spend on decompressing 
 >>in CLOOP driver. Maybe it could be possible to 
 >>do decompression natively and not under emulated 
 >>CPU.
 >>
 >>You can start with an exercise. Setup CLOOP on 
 >>your host (e.g. run Knoppix natively), then run 
 >>another Knoppix inside Qemu, but give it access 
 >>to your CLOOP device as an ide drive:
 >>  qemu ... -cdrom /dev/cdrom -hda /dev/<your cloop>
 >>Now try to use your host cloop device inside Qemu. 

Yes, this idea might be effective on QEMU/Linux.
Same idea is used on user-mode-linux of our KNOPPIX.
   http://unit.aist.go.jp/it/knoppix/uml/index-en.html

But we cann't mount CLOOP file on Windows.

 >>E.g. mount it instead of guest cloop:
 >>  mount ... /dev/hda <guest cloop mount point>
 >>Play with it. If the performance difference 
 >>is substantial, it may justify extra effort 
 >>to implement cloop compatible Qemu disk format 
 >>(I guess qcow is not compatible with cloop), 
 >>so it can be used on Windows.
 >>
 >>I didn't try this, so cannot guarantee that it 
 >>will work. Contact me if you would like to try 
 >>this and need assistance.
 >>
 >>
 >>Regards,
 >>
 >>Piotrek

------
suzaki