Because there isn't much benefit. I do not know of any applications where high-bandwidth flows modify ARP fields.
There is a type of attack which could send lots of arp request at a time. If all of them are sent to the user-space, it will degrade the performance. Ben Pfaff <[email protected]> 于2019年11月20日周三 上午2:48写道： > On Tue, Nov 19, 2019 at 02:55:29PM +0800, kai xi fan wrote: > > why does ovs not generate fast path flows for flows modifying arp > > field ? > > Because there isn't much benefit. I do not know of any applications > where high-bandwidth flows modify ARP fields. > > > I have seen a mega flow in the ovs trace result. Final flow: > > unchanged Megaflow: > > > recirc_id=0,eth,arp,in_port=1,vlan_tci=0x0000/0x1fff,dl_src=5e:89:3e:52:ef:8c,dl_dst=00:00:00:00:00:00 > > Datapath actions: 1,3 > > This sentence seems to be about a different topic, because the output > you show does not involve modifying arp fields. >
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