Eric W. Biederman wrote:
When an outgoing packet has the loopback destination addres, the
skbuff is filled with the network namespace. So the loopback packets
never go outside the namespace. This approach facilitate the migration
of loopback because identification is done by network namespace and
not by address. The loopback has been benchmarked by tbench and the
overhead is roughly 1.5 %
Ugh. 1.5% is noticeable.
We will see with all private network namespace ...
I think it is cheaper to have one loopback device per namespace.
Which removes the need for a skbuff tag.
Yes, probably.
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