Re: [Qemu-devel] [POC] colo-proxy in qemu

[Dong, Eddie]

Hi Stefan:
        Thanks for your comments!

> 
> On Mon, Jul 20, 2015 at 02:42:33PM +0800, Li Zhijian wrote:
> > We are planning to implement colo-proxy in qemu to cache and compare
> packets.
> 
> I thought there is a kernel module to do that?

        Yes, that is the previous solution the COLO sub-community choose to go, 
but we realized it might be not the best choices, and thus we want to bring 
discussion back here :)  More comments are welcome.

> 
> Why does the proxy need to be part of the QEMU process?  -netdev socket or
> host network stack features allow you to process packets in a separate 
> process.

        Hailiang did a very good summary, and we don't need privilege ops so 
far. The main thing that motivated us to revisit is because the former kernel 
land driver would be a pure virtualization (and for high availability) 
component. It may have limited user only at very beginning and thus slower to 
be accepted. And, people typically like to put component to be in user land as 
if it can. 

        In addition, as a pure virtualization feature, we guess people in Qemu 
mailing list may be much more interested to support all the VMMs, such as pure 
Qemu VMM, KVM, etc. 


Thx Eddie