>Commit daf4d3c18da4("odp: Support conntrack orig tuple key.") introduced
>new fields in struct 'pkt_metadata'. pkt_metadata_init() is called for every
>packet in the userspace datapath. When testing a simple single flow case with
>DPDK, we observe a lower throughput after the above commit (it was 14.88
>Mpps before, it is 13 Mpps after).
>
>This patch skips initializing ct_orig_tuple in pkt_metadata_init().
>It should be enough to initialize ct_state, because nobody should look at
>ct_orig_tuple unless ct_state is != 0.
>
>CC: Jarno Rajahalme <ja...@ovn.org>
>Signed-off-by: Daniele Di Proietto <diproiet...@vmware.com>
>---
>I'm sending this as an RFC because I didn't check very carefully if we can
>really
>avoid initializing ct_orig_tuple.
>
>Maybe there are better solutions to this problem.
>---
> lib/packets.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/lib/packets.h b/lib/packets.h index a5a483bc8..6f1791c7a 100644
>--- a/lib/packets.h
>+++ b/lib/packets.h
>@@ -129,7 +129,7 @@ pkt_metadata_init(struct pkt_metadata *md,
>odp_port_t port)
> /* It can be expensive to zero out all of the tunnel metadata. However,
> * we can just zero out ip_dst and the rest of the data will never be
> * looked at. */
>- memset(md, 0, offsetof(struct pkt_metadata, in_port));
>+ memset(md, 0, offsetof(struct pkt_metadata, ct_orig_tuple));
> md->tunnel.ip_dst = 0;
> md->tunnel.ipv6_dst = in6addr_any;
>
It's been a while this RFC patch has been submitted to fix performance drop on
Master. This indeed fixes the OvS-DPDK performance drop that was introduced by
the conntrack commit.
Is there a better fix than what is suggested above?
- Bhanuprakash
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