Re: Kernel 4.13.0-rc4-next-20170811 - IP Routing / Forwarding performance vs Core/RSS number / HT on
flat view
From: Jesper Dangaard Brouer <hidden>
Date: 2017-08-15 10:05:45
On Tue, 15 Aug 2017 11:11:57 +0200 Paweł Staszewski [off-list ref] wrote:
Yes it helped - now there is almost no difference when using vlans or not: 10.5Mpps - with vlan 11Mpps - without vlan
Great! - it seems like we have pinpointed the root-cause. It also demonstrate how big the benefit is of Eric commit (thanks!): https://git.kernel.org/torvalds/c/93f154b594fe
W dniu 2017-08-15 o 03:17, Eric Dumazet pisze:quoted
On Mon, 2017-08-14 at 18:07 -0700, Eric Dumazet wrote:quoted
Or try to hack the IFF_XMIT_DST_RELEASE flag on the vlan netdev.Something like :diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c index 5e831de3103e2f7092c7fa15534def403bc62fb4..9472de846d5c0960996261cb2843032847fa4bf7 100644 --- a/net/8021q/vlan_netlink.c +++ b/net/8021q/vlan_netlink.c@@ -143,6 +143,7 @@ static int vlan_newlink(struct net *src_net, struct net_device *dev, vlan->vlan_proto = proto; vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); vlan->real_dev = real_dev; + dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); vlan->flags = VLAN_FLAG_REORDER_HDR; err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);
-- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer