RE: [EXTERNAL] Re: What throughput is reasonable?

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I can't do that.  Mucking in the kernel stuff is a non-starter for me.


 -----Original Message-----
From: David Woodhouse [mailto:dwmw2@xxxxxxxxxxxxx] 
Sent: Saturday, April 13, 2019 6:02 AM
To: Phillips, Tony
Cc: Nikos Mavrogiannopoulos; Daniel Lenski; openconnect-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [EXTERNAL] Re: What throughput is reasonable?

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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