[Libguestfs] guestfish runs w/ a nested guest

Kashyap Chamarthy kchamart at redhat.com
Thu May 16 16:33:57 UTC 2013

On 05/16/2013 09:12 PM, Richard W.M. Jones wrote:
> On Tue, May 14, 2013 at 06:14:11PM +0530, Kashyap Chamarthy wrote:
>> To summarize:
>> L0 (bare-metal):
>> 	- guestfish run: ~ 3 seconds
>> L1 (guest):
>> 	- w/o nesting, guestfish run: ~ 52 seconds
>> 	- w/ nesting,  guestfish run: ~ 8 seconds  (Almost 6 1/2 times speed improvement)
> Or to put it another way, nested hardware virtualization is over twice
> as slow as ordinary hardware virtualization :-)


But doesn't it look optimistic: given all the I/O, MMU, related on-going research, it
might only get better ?

> However it's still a lot better than TCG, so this is good.

Yes, I have on my TODO to write more coherent details after some further tests. Let me see
if I could muster enough discipline to do it. Now that I mentioned here, it might put
little more pressure on me.

As an aside, when you get a moment, can you please enlighten a bit more on how often we
(in Fedora, elsewhere) use TCG ?

Meantime, I'm reading - http://git.qemu.org/?p=qemu.git;a=blob_plain;f=tcg/README;hb=HEAD



> Rich.


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