[dpdk-dev] [PATCH] doc: introduce PVP reference benchmark
Maxime Coquelin
maxime.coquelin at redhat.com
Wed Nov 23 22:00:06 CET 2016
Having reference benchmarks is important in order to obtain
reproducible performance figures.
This patch describes required steps to configure a PVP setup
using testpmd in both host and guest.
Not relying on external vSwitch ease integration in a CI loop by
not being impacted by DPDK API changes.
Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
doc/guides/howto/img/pvp_2nics.svg | 556 +++++++++++++++++++++++++++
doc/guides/howto/index.rst | 1 +
doc/guides/howto/pvp_reference_benchmark.rst | 389 +++++++++++++++++++
3 files changed, 946 insertions(+)
create mode 100644 doc/guides/howto/img/pvp_2nics.svg
create mode 100644 doc/guides/howto/pvp_reference_benchmark.rst
diff --git a/doc/guides/howto/img/pvp_2nics.svg b/doc/guides/howto/img/pvp_2nics.svg
new file mode 100644
index 0000000..517a800
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diff --git a/doc/guides/howto/index.rst b/doc/guides/howto/index.rst
index 5575b27..712a9f3 100644
--- a/doc/guides/howto/index.rst
+++ b/doc/guides/howto/index.rst
@@ -38,3 +38,4 @@ HowTo Guides
lm_bond_virtio_sriov
lm_virtio_vhost_user
flow_bifurcation
+ pvp_reference_benchmark
diff --git a/doc/guides/howto/pvp_reference_benchmark.rst b/doc/guides/howto/pvp_reference_benchmark.rst
new file mode 100644
index 0000000..042c6aa
--- /dev/null
+++ b/doc/guides/howto/pvp_reference_benchmark.rst
@@ -0,0 +1,389 @@
+.. BSD LICENSE
+ Copyright(c) 2016 Red Hat, Inc. All rights reserved.
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name of Intel Corporation nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+PVP reference benchmark setup using testpmd
+===========================================
+
+This guide lists the steps required to setup PVP benchmark using testpmd as a
+simple forwarder between NICs and Vhost interfaces. The goal of this setup is
+to have a reference PVP benchmark not using external vSwitches (OVS, VPP, ...),
+making easier to obtain reproducible results and easing continuous integration
+testing.
+
+The guide covers two way for launching the VM, either by calling directly QEMU
+command line, or by relying on libvirt. It has been tested working with DPDK
+v16.11, using RHEL7 for both host and guest.
+
+Setup overview
+..............
+
+.. figure:: img/pvp_2nics.svg
+
+ PVP setup using 2 NICs
+
+In this diagram, each red arrow represents one logical core. This use-case
+requires 6 dedicated logical cores. A setup consisting in doing forwarding
+with a single NIC is also possible, requiring 3 logical cores.
+
+Host setup
+..........
+
+In this setup, we isolate 6 cores (from CPU2 to CPU7) in a same NUMA node. Two
+cores are assigned to the VM vCPUs running testpmd, four are assigned to
+testpmd on host.
+
+Host tuning
+~~~~~~~~~~~
+
+#. Append these options to Kernel command line:
+
+ .. code-block:: console
+
+ intel_pstate=disable mce=ignore_ce default_hugepagesz=1G hugepagesz=1G hugepages=6 isolcpus=2-7 rcu_nocbs=2-7 nohz_full=2-7 iommu=pt intel_iommu=on
+
+#. Disable hyper-threads at runtime if necessary and BIOS not accessible:
+
+ .. code-block:: console
+
+ cat /sys/devices/system/cpu/cpu*[0-9]/topology/thread_siblings_list \
+ | sort | uniq \
+ | awk -F, '{system("echo 0 > /sys/devices/system/cpu/cpu"$2"/online")}'
+
+#. Disable NMIs:
+
+ .. code-block:: console
+
+ echo 0 > /proc/sys/kernel/nmi_watchdog
+
+#. Exclude isolated CPUs from the writeback cpumask:
+
+ .. code-block:: console
+
+ echo ffffff03 > /sys/bus/workqueue/devices/writeback/cpumask
+
+#. Isolate CPUs from IRQs:
+
+ .. code-block:: console
+
+ clear_mask=0xfc #Isolate CPU2 to CPU7 from IRQs
+ for i in /proc/irq/*/smp_affinity
+ do
+ echo "obase=16;$(( 0x$(cat $i) & ~$clear_mask ))" | bc > $i
+ done
+
+Qemu build
+~~~~~~~~~~
+
+ .. code-block:: console
+
+ git clone git://dpdk.org/dpdk
+ cd dpdk
+ export RTE_SDK=$PWD
+ make install T=x86_64-native-linuxapp-gcc DESTDIR=install
+
+DPDK build
+~~~~~~~~~~
+
+ .. code-block:: console
+
+ git clone git://dpdk.org/dpdk
+ cd dpdk
+ export RTE_SDK=$PWD
+ make install T=x86_64-native-linuxapp-gcc DESTDIR=install
+
+Testpmd launch
+~~~~~~~~~~~~~~
+
+#. Assign NICs to DPDK:
+
+ .. code-block:: console
+
+ modprobe vfio-pci
+ $RTE_SDK/install/sbin/dpdk-devbind -b vfio-pci 0000:11:00.0 0000:11:00.1
+
+*Note: Sandy Bridge family seems to have some limitations wrt its IOMMU,
+giving poor performance results. To achieve good performance on these machines,
+consider using UIO instead.*
+
+#. Launch testpmd application:
+
+ .. code-block:: console
+
+ $RTE_SDK/install/bin/testpmd -l 0,2,3,4,5 --socket-mem=1024 -n 4 \
+ --vdev 'net_vhost0,iface=/tmp/vhost-user1' \
+ --vdev 'net_vhost1,iface=/tmp/vhost-user2' -- \
+ --portmask=f --disable-hw-vlan -i --rxq=1 --txq=1
+ --nb-cores=4 --forward-mode=io
+
+#. In testpmd interactive mode, set the portlist to obtin the right chaining:
+
+ .. code-block:: console
+
+ set portlist 0,2,1,3
+ start
+
+VM launch
+~~~~~~~~~
+
+The VM may be launched ezither by calling directly QEMU, or by using libvirt.
+
+#. Qemu way:
+
+Launch QEMU with two Virtio-net devices paired to the vhost-user sockets created by testpmd:
+
+ .. code-block:: console
+
+ <QEMU path>/bin/x86_64-softmmu/qemu-system-x86_64 \
+ -enable-kvm -cpu host -m 3072 -smp 3 \
+ -chardev socket,id=char0,path=/tmp/vhost-user1 \
+ -netdev type=vhost-user,id=mynet1,chardev=char0,vhostforce \
+ -device virtio-net-pci,netdev=mynet1,mac=52:54:00:02:d9:01,addr=0x10 \
+ -chardev socket,id=char1,path=/tmp/vhost-user2 \
+ -netdev type=vhost-user,id=mynet2,chardev=char1,vhostforce \
+ -device virtio-net-pci,netdev=mynet2,mac=52:54:00:02:d9:02,addr=0x11 \
+ -object memory-backend-file,id=mem,size=3072M,mem-path=/dev/hugepages,share=on \
+ -numa node,memdev=mem -mem-prealloc \
+ -net user,hostfwd=tcp::1002$1-:22 -net nic \
+ -qmp unix:/tmp/qmp.socket,server,nowait \
+ -monitor stdio <vm_image>.qcow2
+
+You can use this qmp-vcpu-pin script to pin vCPUs:
+
+ .. code-block:: python
+
+ #!/usr/bin/python
+ # QEMU vCPU pinning tool
+ #
+ # Copyright (C) 2016 Red Hat Inc.
+ #
+ # Authors:
+ # Maxime Coquelin <maxime.coquelin at redhat.com>
+ #
+ # This work is licensed under the terms of the GNU GPL, version 2. See
+ # the COPYING file in the top-level directory
+ import argparse
+ import json
+ import os
+
+ from subprocess import call
+ from qmp import QEMUMonitorProtocol
+
+ pinned = []
+
+ parser = argparse.ArgumentParser(description='Pin QEMU vCPUs to physical CPUs')
+ parser.add_argument('-s', '--server', type=str, required=True,
+ help='QMP server path or address:port')
+ parser.add_argument('cpu', type=int, nargs='+',
+ help='Physical CPUs IDs')
+ args = parser.parse_args()
+
+ devnull = open(os.devnull, 'w')
+
+ srv = QEMUMonitorProtocol(args.server)
+ srv.connect()
+
+ for vcpu in srv.command('query-cpus'):
+ vcpuid = vcpu['CPU']
+ tid = vcpu['thread_id']
+ if tid in pinned:
+ print 'vCPU{}\'s tid {} already pinned, skipping'.format(vcpuid, tid)
+ continue
+
+ cpuid = args.cpu[vcpuid % len(args.cpu)]
+ print 'Pin vCPU {} (tid {}) to physical CPU {}'.format(vcpuid, tid, cpuid)
+ try:
+ call(['taskset', '-pc', str(cpuid), str(tid)], stdout=devnull)
+ pinned.append(tid)
+ except OSError:
+ print 'Failed to pin vCPU{} to CPU{}'.format(vcpuid, cpuid)
+
+
+That can be used this way, for example to pin 3 vCPUs to CPUs 1, 6 and 7:
+
+ .. code-block:: console
+
+ export PYTHONPATH=$PYTHONPATH:<QEMU path>/scripts/qmp
+ ./qmp-vcpu-pin -s /tmp/qmp.socket 1 6 7
+
+#. Libvirt way:
+
+Some initial steps are required for libvirt to be able to connect to testpmd's
+sockets.
+
+First, SELinux policy needs to be set to permissiven, as testpmd is run as root
+(reboot required):
+
+ .. code-block:: console
+
+ cat /etc/selinux/config
+
+ # This file controls the state of SELinux on the system.
+ # SELINUX= can take one of these three values:
+ # enforcing - SELinux security policy is enforced.
+ # permissive - SELinux prints warnings instead of enforcing.
+ # disabled - No SELinux policy is loaded.
+ SELINUX=permissive
+ # SELINUXTYPE= can take one of three two values:
+ # targeted - Targeted processes are protected,
+ # minimum - Modification of targeted policy. Only selected processes are protected.
+ # mls - Multi Level Security protection.
+ SELINUXTYPE=targeted
+
+
+Also, Qemu needs to be run as root, which has to be specified in /etc/libvirt/qemu.conf:
+
+ .. code-block:: console
+
+ user = "root"
+
+Once the domain created, following snippset is an extract of most important
+information (hugepages, vCPU pinning, Virtio PCI devices):
+
+ .. code-block:: xml
+
+ <domain type='kvm'>
+ <memory unit='KiB'>3145728</memory>
+ <currentMemory unit='KiB'>3145728</currentMemory>
+ <memoryBacking>
+ <hugepages>
+ <page size='1048576' unit='KiB' nodeset='0'/>
+ </hugepages>
+ <locked/>
+ </memoryBacking>
+ <vcpu placement='static'>3</vcpu>
+ <cputune>
+ <vcpupin vcpu='0' cpuset='1'/>
+ <vcpupin vcpu='1' cpuset='6'/>
+ <vcpupin vcpu='2' cpuset='7'/>
+ <emulatorpin cpuset='0'/>
+ </cputune>
+ <numatune>
+ <memory mode='strict' nodeset='0'/>
+ </numatune>
+ <os>
+ <type arch='x86_64' machine='pc-i440fx-rhel7.0.0'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <cpu mode='host-passthrough'>
+ <topology sockets='1' cores='3' threads='1'/>
+ <numa>
+ <cell id='0' cpus='0-2' memory='3145728' unit='KiB' memAccess='shared'/>
+ </numa>
+ </cpu>
+ <devices>
+ <interface type='vhostuser'>
+ <mac address='56:48:4f:53:54:01'/>
+ <source type='unix' path='/tmp/vhost-user1' mode='client'/>
+ <model type='virtio'/>
+ <driver name='vhost' rx_queue_size='256' />
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x10' function='0x0'/>
+ </interface>
+ <interface type='vhostuser'>
+ <mac address='56:48:4f:53:54:02'/>
+ <source type='unix' path='/tmp/vhost-user2' mode='client'/>
+ <model type='virtio'/>
+ <driver name='vhost' rx_queue_size='256' />
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x11' function='0x0'/>
+ </interface>
+ </devices>
+ </domain>
+
+Guest setup
+...........
+
+Guest tuning
+~~~~~~~~~~~~
+
+#. Append these options to Kernel command line:
+
+ .. code-block:: console
+
+ default_hugepagesz=1G hugepagesz=1G hugepages=1 intel_iommu=on iommu=pt isolcpus=1,2 rcu_nocbs=1,2 nohz_full=1,2
+
+#. Disable NMIs:
+
+ .. code-block:: console
+
+ echo 0 > /proc/sys/kernel/nmi_watchdog
+
+#. Exclude isolated CPU1 and CPU2 from the writeback wq cpumask:
+
+ .. code-block:: console
+
+ echo 1 > /sys/bus/workqueue/devices/writeback/cpumask
+
+#. Isolate CPUs from IRQs:
+
+ .. code-block:: console
+
+ clear_mask=0x6 #Isolate CPU1 and CPU2 from IRQs
+ for i in /proc/irq/*/smp_affinity
+ do
+ echo "obase=16;$(( 0x$(cat $i) & ~$clear_mask ))" | bc > $i
+ done
+
+DPDK build
+~~~~~~~~~~
+
+ .. code-block:: console
+
+ git clone git://dpdk.org/dpdk
+ cd dpdk
+ export RTE_SDK=$PWD
+ make install T=x86_64-native-linuxapp-gcc DESTDIR=install
+
+Testpmd launch
+~~~~~~~~~~~~~~
+
+Probe vfio module without iommu:
+
+ .. code-block:: console
+
+ modprobe -r vfio_iommu_type1
+ modprobe -r vfio
+ modprobe vfio enable_unsafe_noiommu_mode=1
+ cat /sys/module/vfio/parameters/enable_unsafe_noiommu_mode
+ modprobe vfio-pci
+
+Bind virtio-net devices to DPDK:
+
+ .. code-block:: console
+
+ $RTE_SDK/tools/dpdk-devbind.py -b vfio-pci 0000:00:10.0 0000:00:11.0
+
+Start testpmd:
+
+ .. code-block:: console
+
+ $RTE_SDK/install/bin/testpmd -l 0,1,2 --socket-mem 1024 -n 4 \
+ --proc-type auto --file-prefix pg -- \
+ --portmask=3 --forward-mode=macswap --port-topology=chained \
+ --disable-hw-vlan --disable-rss -i --rxq=1 --txq=1 \
+ --rxd=256 --txd=256 --nb-cores=2 --auto-start
--
2.9.3
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