Please also try this patch to the kernel tun driver.
--- /usr/src/debug/kernel-5.0.fc29/linux-5.0.5-200.fc29.x86_64/drivers/net/tun.c 2019-03-03 23:21:29.000000000 +0000
+++ /home/fedora/tun/tun.c 2019-04-11 09:11:20.781683956 +0000
@@ -1118,8 +1118,14 @@ static netdev_tx_t tun_net_xmit(struct s
nf_reset(skb);
- if (ptr_ring_produce(&tfile->tx_ring, skb))
+ if (ptr_ring_produce(&tfile->tx_ring, skb)) {
+ netif_stop_subqueue(tun->dev, txq);
goto drop;
+ }
+
+ if (ptr_ring_full(&tfile->tx_ring)) {
+ netif_stop_subqueue(tun->dev, txq);
+ }
/* Notify and wake up reader process */
if (tfile->flags & TUN_FASYNC)
@@ -2229,6 +2235,8 @@ static ssize_t tun_do_read(struct tun_st
consume_skb(skb);
}
+ netif_wake_subqueue(tun->dev, tfile->queue_index);
+
return ret;
}
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