skb_get_hash() returns a 0 (invalid hash) for arp packets resulting in same
ids_index for every arp packet. This results in a single ovs-vswitchd handler
thread processing every arp packet severely impacting the average latency of
arps. This change spreads the work evenly between all the handler threads.
datapath/vport.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/datapath/vport.c b/datapath/vport.c
index 024491f..20d20fa 100644
--- a/datapath/vport.c
+++ b/datapath/vport.c
@@ -465,6 +465,12 @@ u32 ovs_vport_find_upcall_portid(const struct
vport *vport, struct sk_buff *skb)
if (ids->n_ids == 1 && ids->ids[0] == 0)
return 0;
+ /* skb_get_hash() is not supporting ETH_P_ARP packets returning a 0
+ * (invalid hash) for every ARP.
+ */
+ if (skb->protocol == ntohs(ETH_P_ARP))
+ return ids->ids[vport->port_no%ids->n_ids];
+
hash = skb_get_hash(skb);
return ids->ids[hash - ids->n_ids * reciprocal_divide(hash,
ids->rn_ids)];
}
--
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