[Devel] Re: [RFC][PATCH] IP address restricting cgroup subsystem

[Guenter Roeck]

On Fri, Jan 09, 2009 at 10:12:24AM -0800, Dan Smith wrote:
> GR> I have tried something similar, only with
> GR> CLONE_FILES|CLONE_FS|CLONE_VM|CLONE_NEWNET, and actually creating
> GR> a virtual interface and controlling socket or thread in each new
> GR> network namespace.
> 
> My initial test was to create a veth pair and move one end into the
> namespace during create.  That failed in the same way, so I took the
> veth's out of the equation with the posted test.
> 
> GR> This scales to a couple of thousand interfaces, though interface
> GR> creation takes a long time if more than 1,000 interfaces or so are
> GR> created.
> 
This is at least to some degree due to the problems I mentioned earlier.
Enhancing the kernel name hash and the sysfs implementation improves
performance a lot.

> Yeah, just creating a bunch of pairs starts to slow down after a
> hundred veth's or so.  I think that for thousands of network
> namespaces, things would be pretty painful.
> 
> GR> I can send you the code if you like.
> 
> I'd like to see it.
> 
See attached. I used the "ctx" module in the attached code to create interfaces, 
so you'll have to compile and insmod it if you want to create interfaces.

Guenter
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