From: "Michael S. Tsirkin" <mst@redhat.com>
To: Jason Wang <jasowang@redhat.com>
Cc: davem@davemloft.net, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [net-next PATCH 2/2] tuntap: initialize vlan_features
Date: Thu, 11 Apr 2013 12:55:31 +0300 [thread overview]
Message-ID: <20130411095531.GC21362@redhat.com> (raw)
In-Reply-To: <1365672742-42258-3-git-send-email-jasowang@redhat.com>
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 <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@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 9:55 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 ` [net-next PATCH 2/2] tuntap: " Jason Wang
2013-04-11 9:55 ` Michael S. Tsirkin [this message]
2013-04-11 20:22 ` [net-next PATCH 0/2] vlan TSO support for virtio-net David Miller
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