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Re: Re: [RFC] network namespaces [message #6006 is a reply to message #6005] Wed, 06 September 2006 17:36 Go to previous messageGo to previous message
kir is currently offline  kir
Messages: 1645
Registered: August 2005
Location: Moscow, Russia
Senior Member

Herbert Poetzl wrote:
> my point (until we have an implementation which clearly
> shows that performance is equal/better to isolation)
> is simply this:
>
> of course, you can 'simulate' or 'construct' all the
> isolation scenarios with kernel bridging and routing
> and tricky injection/marking of packets, but, this
> usually comes with an overhead ...
>
Well, TANSTAAFL*, and pretty much everything comes with an overhead.
Multitasking comes with the (scheduler, context switch, CPU cache, etc.)
overhead -- is that the reason to abandon it? OpenVZ and Linux-VServer
resource management also adds some overhead -- do we want to throw it away?

The question is not just "equal or better performance", the question is
"what do we get and how much we pay for it".

Finally, as I understand both network isolation and network
virtualization (both level2 and level3) can happily co-exist. We do have
several filesystems in kernel. Let's have several network virtualization
approaches, and let a user choose. Is that makes sense?


* -- http://en.wikipedia.org/wiki/TANSTAAFL
 
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