On Mon, Jan 25, 2016 at 03:52:08PM -0600, David Young wrote: > > That stopped the user-tickle watchdog from firing. It was handy having > a full-fledged thread context to process packets in. But there were > trade-offs. As Matt Thomas pointed out to me, if it takes longer for > the NIC to read the next packet off of the network than it takes your > thread to process the current packet, then your Rx thread is going to go > back to sleep again after every single packet. So there's potentially > a lot of context-switch overhead and latency when you're receiving > back-to-back large packets.
Linux passes more than one packet at a time between protocol layers (either with hardware assist from NICs that do "large receive offload" or faked up early in the processing path elsewise. Would that help? Thor
