On 15-12-30 09:55 AM, John Fastabend wrote:

Now that pfifo_fast is using the alf_queue data structures we can
dequeue multiple skbs and save some overhead.

This works because the bulk dequeue logic accepts skb lists already.

Signed-off-by: John Fastabend <redacted>
---

oops I didn't mean to send this it obviously doesn't work because
until you have 8 skbs nothing gets dequeued. This was just a test
patch I was looking at for perf numbers. Maybe it provides some
insight into how we could build a pfifo_bulk or add an option to
pfifo_fast to dequeue multiple pkts at a time. The trick is to
sort out how long to wait for packets to build up or possibly
just remove this line,

+	if (this_cpu_ptr(qdisc->cpu_qstats)->qlen < 8)
+		return NULL;

And opportunistically pull packets out at the risk of over-running
the driver if those are large skbs.

.John