Jack Vogel wrote:
On 5/31/07, Wilkinson, Alex <[EMAIL PROTECTED]> wrote:0n Wed, May 30, 2007 at 04:45:05PM -0700, Jack Vogel wrote:> Does any driver do this now? And if a driver were to coalesce > packets and send something up the stack that violates mss > will it barf? erm, what is meant by "coalesce" ?combining packets before sending to the stack, aka LRO.
Yup - the firmware for the card's LRO engine would have to know not to coalesce packets not destined for the local host. I speculate many cards are not smart enough to do this, and LRO is an all-or-nothing proposition, as it's a technology designed to optimize for hosts, not routers; see recent discussions/slanging matches on end2end.
At the moment there is no central place where we track all layer 2 addresses for which traffic should be delivered locally. This would logically belong in struct ifnet, and clients e.g. CARP would have to be taught to add their layer 2 endpoint addresses there.
It seems acceptable to disable LRO if bridging is on and document this behaviour.
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