On Tue, 23 Jul 2013 15:15:48 +0800 Jason Wang <[email protected]> wrote:
> Inspired by commit f09e2249c4f5c7c13261ec73f5a7807076af0c8e (macvtap: restore > vlan header on user read). This patch adds hardware vlan tx support for > tuntap. This is done by copying vlan header directly into userspace in > tun_put_user() instead of doing it through __vlan_put_tag() in > dev_hard_start_xmit(). This eliminates one unnecessary memove in > vlan_insert_tag() for 802.1ad and 802.1q traffic. > > pktgen test shows about 20% improvement for 802.1q traffic: > > Before: > 662149pps 317Mb/sec (317831520bps) errors: 0 > After: > 801033pps 384Mb/sec (384495840bps) errors: 0 > > Cc: Basil Gor <[email protected]> > Cc: Michael S. Tsirkin <[email protected]> > Signed-off-by: Jason Wang <[email protected]> You need to make this configurable by some mechanism, since otherwise it will break applications that expect current VLAN behavior -- 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/
