I was reading David's blog entries on the netdev meeting in Japan, and
have a question about this bit:
Currently, things like Xen have to put the card into promiscuous
mode, accepting all packets, which is quite inefficient.
Is the inefficient bit meant for accepting all packets, or more broadly
that the promiscuous path is quite inefficient compared to the
non-promiscuous path?
I ask because I would have thought that if the system were connected to
a switch (*), the number of packets received through a NIC in
promiscuous mode would be nearly the same as when it was not in
promiscuous mode - the delta being (perhaps) multicast frames.
rick jones
(*) "Today," it seems 99 times out of 10 systems are connected to
switches not hubs.
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