On Mon, 2016-11-28 at 09:54 -0500, David Miller wrote: > From: Lino Sanfilippo <lsan...@marvell.com> > 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 or val = 1000000; setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val));
