netdev - [PATCH RFC 0/2] tun: lockless xmit

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Message-Id: <cover.1460393493.git.pabeni@redhat.com>
Date:	Wed, 13 Apr 2016 11:04:45 +0200
From:	Paolo Abeni <pabeni@...hat.com>
To:	netdev@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg Kurz <gkurz@...ux.vnet.ibm.com>,
	Jason Wang <jasowang@...hat.com>
Subject: [PATCH RFC 0/2] tun: lockless xmit

This patch series try to remove the need for any lock in the tun device
xmit path, significantly improving the forwarding performance when multiple
processes are accessing the tun device (i.e. in a nic->bridge->tun->vm scenario).

The lockless xmit is obtained explicitly setting the NETIF_F_LLTX feature bit
and removing the default qdisc.

Unlikely most virtual devices, the tun driver has featured a default qdisc
for a long period, but it already lost such feature in linux 4.3.

Paolo Abeni (2):
  tun: don't require serialization lock on tx
  tun: don't set a default qdisc

 drivers/net/tun.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

-- 
1.8.3.1