On Thu, Apr 11, 2013 at 05:32:22PM +0800, Jason Wang wrote: > 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 <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]> > --- > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
