Hi,
While I was testing ODP-DPDK performance with unidirectional traffic
(packets flow in ifA and goes out ifB) I noticed that the performance is
very poor. It is because there is one l2fwd threads per interface, both
receiving on its own port and sending out on the other. In my scenario
only one of them are doing work, the other is just in the way because
the two thread are competing on the spinlock of one interface. One needs
it for sending, the other idle thread is just keep polling for receive.
There are talks to refine pktio interface to make sure threads can have
their own HW queues (if the platform supports that), but in the meantime
it would be good to have the ability to do l2fwd tests with just one
direction. I've sent in a patch for that, let's discuss it there.
The other thing I've found as a performance hit is parsing:
drop_err_pkts() calls odp_packet_has_error() which triggers it. It's
reasonable to do that, but in case of ODP-DPDK it's done completely in
software, and in certain cases you can be rather interested in the
performance without parsing.
What do you think making it optional?
Regards,
Zoli
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