On Mon, Sep 04, 2017 at 05:52:52PM +0200, Adrien Mazarguil wrote: > Arjun, > > On Thu, Jun 29, 2017 at 05:26:02AM +0000, Shahaf Shuler wrote: > > Hi Arjun, > > > > Thursday, June 22, 2017 9:40 PM, Arjun Roy, > > > > > > Greetings all. > > > > > > I have a weird issue regarding excessive latency using Mellanox ConnectX-4 > > > 100Gbe cards, DPDK and packet forwarding. Specifically: running the l3fwd > > > and basicfwd DPDK example programs yields ping latencies of several (5-8) > > > milliseconds. I tried the same test using an Intel X-540 AT2 card on the > > > same > > > systems and the latency was on the order of 4-5 microseconds. > > > > Thanks for reporting. > > This is the first time we hit such scenario, we will check it internally > > and will get back to you with answers. > > Back to this topic, could it be the same issue as reported by Sagi, > "mlx5 high latency observed on send operations" [1]? > > The related patches have been submitted and are on track for DPDK 17.11. > While they are not yet on the master tree, you can find them on > dpdk-next-net. > > [1] http://dpdk.org/ml/archives/dev/2017-August/073081.html
Note this patches are not enough, there is also an issue on Verbs side, the fixes there should be part of the next MLNX_OFED 4.2, otherwise it is already fixed in rdma-core but for that it will need the PMD support for that [1]. Regards, [1] http://dpdk.org/ml/archives/dev/2017-September/074278.html -- Nélio Laranjeiro 6WIND
