Re: Kernel 4.13.0-rc4-next-20170811 - IP Routing / Forwarding performance vs Core/RSS number / HT on
flat view
From: Paweł Staszewski <hidden>
Date: 2017-09-09 09:05:10
Hi Are there any plans to have this fix normally in kernel ? Or it is mostly only hack - not longterm fix and need to be different ? All tests that was done shows that without this patch there is about 20-30% network forwarding performance degradation when using vlan interfaces Thanks Paweł W dniu 2017-08-15 o 03:17, Eric Dumazet pisze:
quoted hunk ↗ jump to hunk
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);