* DPDK and packet loss troubleshooting
@ 2022-05-07 16:55 Laurent Dumont
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From: Laurent Dumont @ 2022-05-07 16:55 UTC (permalink / raw)
To: users
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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
cores.
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?
Thanks!
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