On Mon, 2016-11-28 at 09:54 -0500, David Miller wrote:
From: Lino Sanfilippo <lsanfil@xxxxxxxxxxx>
Date: Mon, 28 Nov 2016 14:07:51 +0100
Calling skb_orphan() in the xmit handler made this issue disappear.
This is not the way to handle this problem.
The solution is to free the SKBs in a timely manner after the
chip has transmitted the frame.
Note that the 'pauses' described by Pavel are also caused by a too small
SO_SNDBUF value on the UDP socket.
An immediate fix, with no kernel change is to increase it.
echo 1000000 >/proc/sys/net/core/wmem_default
val = 1000000;
setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val));