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556d6fd47b
The root cause of the slowdown on the first packet with timestamps,
as primary related to refilling the fill-queue, which happend before
process_packet.
Primary cause, as first packet still see a slowdown of around 4 usec
while it was around 9 usec before.
In commit 5df5332f23 ("AF_XDP-interaction: config AF_XDP frame_headroom")
the fill-queue size was increase to be larger. This caused the
first call to handle_receive_packets() to refill too many frames
into the fill-queue.
Patch split out refill into function restock_receive_fill_queue()
which is now called *after* process_packet step, but before
releasing RX packets via xsk_ring_cons__release(&xsk->rx).
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>