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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 <zhangyu31@baidu.com>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Li RongQing 2018-08-29 11:52:10 +08:00 committed by David S. Miller
parent 920767a9c8
commit 016f3d1818
1 changed files with 1 additions and 1 deletions
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2
drivers/net/vxlan.c
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@ -464,7 +464,7 @@ static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
struct vxlan_fdb *f; struct vxlan_fdb *f;
f = __vxlan_find_mac(vxlan, mac, vni); f = __vxlan_find_mac(vxlan, mac, vni);
if (f) if (f && f->used != jiffies)
f->used = jiffies; f->used = jiffies;
return f; return f;