Patrick McHardy wrote:

That sounds like it would also be possible using rtnetlink. You could
send out a notification whenever you switch the active buffer and have
userspace listen to these and replace the inactive one.

Also, I think you will need a larger cache than 4-8k if you are running 
higher speeds (100,000 pps, etc),
as you probably can't rely on user-space responding reliably every 10ms 
(or even less time for faster
speeds.)

Thanks,
Ben

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Ben Greear [off-list ref] 
Candela Technologies Inc  http://www.candelatech.com