Messages in this thread Patch in this message | | | From | Jason Wang <> | Subject | [net-next PATCH 2/2] tuntap: initialize vlan_features | Date | Thu, 11 Apr 2013 17:32:22 +0800 |
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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
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