On Thu, Mar 12, 2026 at 9:07 PM Simon Schippers
[off-list ref] wrote:

Introduce tun_ring_consume() that wraps ptr_ring_consume() and calls
__tun_wake_queue(). The latter wakes the stopped netdev subqueue once
half of the ring capacity has been consumed, tracked via the new
cons_cnt field in tun_file. When the ring is empty the queue is also
woken to handle potential races.

Without the corresponding queue stopping (introduced in a subsequent
commit), this patch alone causes no regression for a tap setup sending
to a qemu VM: 1.151 Mpps to 1.153 Mpps.

Another call to squash this into next patch.

Thanks