We have been doing some performance testing with a voice system.
In almost all cases, these tests are failing. They are failing for two reasons:
- Rx Missed counters on the physical adaptors of the hypervisors that are used to send the test traffic. These adaptors are connected to the E-NVDS virtual switch on one side, and to an upstream Arista data center switch on the other.
- Dropped Packets - mostly media (RTP UDP), with less than 2% of the drops being RTCP traffic (TCP).
Lately, I used the"Performance Best Practices for VMWare vSphere 7.0" guide, as a method for trying to improve the dropped packets were seeing.
We attempted several things that were mentioned in this document:
- ESxi NiC - enable Receive Side Scaling (RSS)
- Actually, to be technical, we enabled DRSS (Default Queue RSS) rather than the RSS (NetQ RSS) which the i40en driver also supported for this Intel X710 adaptor.
- LatencySensitivity=High - and we checked "Reserve all Memory" on the checkbox
- Interrupt Coalescing
- Disabling it, to see what affect disabling it had
- Setting it from its rate-based scheme (the default, rbc) to static with 64 packets per interrupt
We didn't really see any noticeable improvement from the Receive Side Scaling or the Latency Sensitivity settings, which was a surprise, actually. We did see some perhaps minor improvement on the interrupt coalescing when we set it to static.
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