From: Jason Wang <jasowang@redhat.com>
To: davem@davemloft.net, mst@redhat.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Jason Wang <jasowang@redhat.com>
Subject: [net-next PATCH 2/2] tuntap: initialize vlan_features
Date: Thu, 11 Apr 2013 17:32:22 +0800 [thread overview]
Message-ID: <1365672742-42258-3-git-send-email-jasowang@redhat.com> (raw)
In-Reply-To: <1365672742-42258-1-git-send-email-jasowang@redhat.com>
The vlan_features was zero which prevents vlan GSO packets to be transmitted to
userspace. This is suboptimal so enable this by initialize vlan_features for
tuntap.
Netperf shows better performance of guest receiving since vlan TSO works for
tuntap:
before:
netperf -H 192.168.5.4
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.5.4 ()
port 0 AF_INET : demo
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 10.01 2786.67
after:
netperf -H 192.168.5.4
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.5.4 ()
port 0 AF_INET : demo
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 10.00 8085.49
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/net/tun.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 29538e6..316c759 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1656,6 +1656,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST |
TUN_USER_FEATURES;
dev->features = dev->hw_features;
+ dev->vlan_features = dev->features;
INIT_LIST_HEAD(&tun->disabled);
err = tun_attach(tun, file);
--
1.7.1
next prev parent reply other threads:[~2013-04-11 9:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-11 9:32 [net-next PATCH 0/2] vlan TSO support for virtio-net Jason Wang
2013-04-11 9:32 ` [net-next PATCH 1/2] virtio-net: initialize vlan_features Jason Wang
2013-04-11 9:55 ` Michael S. Tsirkin
2013-04-11 9:32 ` Jason Wang [this message]
2013-04-11 9:55 ` [net-next PATCH 2/2] tuntap: " Michael S. Tsirkin
2013-04-11 20:22 ` [net-next PATCH 0/2] vlan TSO support for virtio-net David Miller
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