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From: Laurent Dumont <laurentfdumont@gmail.com>
To: users@dpdk.org
Subject: DPDK and packet loss troubleshooting
Date: Sat, 7 May 2022 12:55:18 -0400
Message-ID: <CAOAKi8xHgVZmEWOLZ9zsD93G6JA2N6jMEZ9sPxV2K43e0Cm4cQ@mail.gmail.com> (raw)

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Hey folks,

We are troubleshooting a vendor application that is leveraging DPDK at the
application layer.

   - Openstack with RHOSP / RHEL
   - OVS as the underlying virtual switching layer. *The VM is not using
   SRIOV ports.*
   - VM acts as a load balancer (traffic pattern in IN+OUT). Traffic
   arrives on a VLAN (provider network) and exits through a VXLAN network
   (internal) to be forwarded to application servers.
   - VMs are using pinned cores
      - 4 cores total
      - 2 for the OS
      - 2 for DPDK : 1 TX one RX
   - Using hugepages
   - There are no other VMs on the physical compute.
   - compute is using isolated cores for the OS. No collision with the VM

At low packet rates (20k~ PPS), it seems that the DPDK layer fails to
transmit packets on the TX queue. This triggers a failover.

We are not seeing anything particularly obvious on the compute side. Is
there anything at the DPDK layer that should be clear about why there is a
failure to TX?


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                 reply	other threads:[~2022-05-07 16:55 UTC|newest]

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