4 QEMU is used for vhost testing enviroment. By default, standard QEMU version
5 preinstalled from OS repositories is used (qemu-2.11.1 for Ubuntu 18.04,
6 qemu-2.5.0 for Ubuntu 16.04) and the path to the QEMU binary can be adjusted
9 FD.io CSIT performance lab is testing VPP vhost with KVM VMs using
10 following environment settings:
12 - Tests with varying Qemu virtio queue (a.k.a. vring) sizes: [vr1024] 1024
13 descriptors to optimize for packet throughput.
14 - Tests with varying Linux :abbr:`CFS (Completely Fair Scheduler)`
15 settings: [cfs] default settings, [cfsrr1] CFS RoundRobin(1) policy
16 applied to all data plane threads handling test packet path including
17 all VPP worker threads and all Qemu testpmd poll-mode threads.
18 - Resulting test cases are all combinations with [vr1024] and
19 [cfs,cfsrr1] settings.
20 - Adjusted Linux kernel :abbr:`CFS (Completely Fair Scheduler)`
21 scheduler policy for data plane threads used in CSIT is documented in
22 `CSIT Performance Environment Tuning wiki
23 <https://wiki.fd.io/view/CSIT/csit-perf-env-tuning-ubuntu1604>`_.
24 - The purpose is to verify performance impact (MRR and NDR/PDR
25 throughput) and same test measurements repeatability, by making VPP
26 and VM data plane threads less susceptible to other Linux OS system
27 tasks hijacking CPU cores running those data plane threads.
29 CSIT does support two types VM definitions: Image or Kernel.
34 CSIT can use a pre-created VM image. The path to image can be adjusted in
35 `Constants.py`. For convenience and full compatibility CSIT repository contains
36 a set of scripts to prepare `Built-root <https://buildroot.org/>`_ based
37 embedded Linux image with all the dependencies needed to run DPDK testpmd, DPDK
38 l3fwd, Linux bridge or Linux IPv4 forwarding.
40 Built-root was chosen for a VM image to be lightweight and booting time
41 should not impact tests duration.
43 VM image must have installed at least qemu-guest-agent, sshd, bridge-utils,
44 VirtIO support and DPDK Testpmd/L3fwd application. Username/password for the VM
45 must be cisco/cisco and NOPASSWD sudo access. The interface naming is based on
46 driver (management interface type is Intel E1000), all E1000 interfaces will be
47 named mgmt<n> and all VirtIO interfaces will be named virtio<n>. In VM
48 "/etc/init.d/qemu-guest-agent" must be set to "TRANSPORT=isa-serial:/dev/ttyS1"
49 because ttyS0 is used by serial console and ttyS1 is dedicated for
50 qemu-guest-agent in QEMU setup.
55 As an alternative to image VM, CSIT can use a kernel KVM image as a boot kernel.
56 This option allows better configurability of what application is running in VM
57 userspace. As a filesystem root9p is used which allows to map the host OS
58 filesystem as read only guest OS filesystem.
60 Example of custom init script for the kernel VM:
64 mount -t sysfs -o "nodev,noexec,nosuid" sysfs /sys
65 mount -t proc -o "nodev,noexec,nosuid" proc /proc
68 mount -t devpts -o "rw,noexec,nosuid,gid=5,mode=0620" devpts /dev/pts || true
69 mount -t tmpfs -o "rw,noexec,nosuid,size=10%,mode=0755" tmpfs /run
70 mount -t tmpfs -o "rw,noexec,nosuid,size=10%,mode=0755" tmpfs /tmp
71 mount -t hugetlbfs -o "rw,relatime,pagesize=2M" hugetlbfs /dev/hugepages
72 echo 0000:00:06.0 > /sys/bus/pci/devices/0000:00:06.0/driver/unbind
73 echo 0000:00:07.0 > /sys/bus/pci/devices/0000:00:07.0/driver/unbind
74 echo uio_pci_generic > /sys/bus/pci/devices/0000:00:06.0/driver_override
75 echo uio_pci_generic > /sys/bus/pci/devices/0000:00:07.0/driver_override
76 echo 0000:00:06.0 > /sys/bus/pci/drivers/uio_pci_generic/bind
77 echo 0000:00:07.0 > /sys/bus/pci/drivers/uio_pci_generic/bind
81 The `$vnf_bin` variable is replaced, during runtime by the QemuUtils libraries,
82 by the path to NF binary and its parameters. This allows CSIT to run the
83 applications installed on host OS, for example VPP of the same version as
86 Kernel KVM image must be available on host filesystem as a prerequisite.
87 The path to kernel image is defined in `Constants.py`.