From: Li RongQing Date: Wed, 29 Aug 2018 03:52:10 +0000 (+0800) Subject: vxlan: reduce dirty cache line in vxlan_find_mac X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=016f3d1818b047c80100d92f023916f9c8d34d3c;p=openwrt%2Fstaging%2Fblogic.git vxlan: reduce dirty cache line in vxlan_find_mac vxlan_find_mac() unconditionally set f->used for every packet, this causes a cache miss for every packet, since remote, hlist and used of vxlan_fdb share the same cache line, which are accessed when send every packets. so f->used is set only if not equal to jiffies, to reduce dirty cache line times, this gives 3% speed-up with small packets. Signed-off-by: Zhang Yu Signed-off-by: Li RongQing Signed-off-by: David S. Miller --- diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index ababba37d735..e5d236595206 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -464,7 +464,7 @@ static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, struct vxlan_fdb *f; f = __vxlan_find_mac(vxlan, mac, vni); - if (f) + if (f && f->used != jiffies) f->used = jiffies; return f;