4 FD.io CSIT performance lab is testing VPP vhost with KVM VMs using
5 following environment settings:
7 - Tests with varying Qemu virtio queue (a.k.a. vring) sizes: [vr256]
8 default 256 descriptors, [vr1024] 1024 descriptors to optimize for
10 - Tests with varying Linux :abbr:`CFS (Completely Fair Scheduler)`
11 settings: [cfs] default settings, [cfsrr1] CFS RoundRobin(1) policy
12 applied to all data plane threads handling test packet path including
13 all VPP worker threads and all Qemu testpmd poll-mode threads.
14 - Resulting test cases are all combinations with [vr256,vr1024] and
15 [cfs,cfsrr1] settings.
16 - Adjusted Linux kernel :abbr:`CFS (Completely Fair Scheduler)`
17 scheduler policy for data plane threads used in CSIT is documented in
18 `CSIT Performance Environment Tuning wiki
19 <https://wiki.fd.io/view/CSIT/csit-perf-env-tuning-ubuntu1604>`_.
20 - The purpose is to verify performance impact (MRR and NDR/PDR
21 throughput) and same test measurements repeatability, by making VPP
22 and VM data plane threads less susceptible to other Linux OS system
23 tasks hijacking CPU cores running those data plane threads.