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[csit.git] / docs / report / introduction / methodology_kvm_vms_vhost_user.rst

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