> -----Original Message----- > From: Maxime Coquelin [mailto:maxime.coque...@redhat.com] > Sent: Tuesday, December 6, 2016 12:25 PM > To: yuanhan....@linux.intel.com; thomas.monja...@6wind.com; Mcnamara, John > <john.mcnam...@intel.com>; Yang, Zhiyong <zhiyong.y...@intel.com>; > ktray...@redhat.com; dev@dpdk.org > Cc: Maxime Coquelin <maxime.coque...@redhat.com> > Subject: [PATCH v2] doc: introduce PVP reference benchmark > > 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.coque...@redhat.com>
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style="fill:none;fill-rule:evenodd;stroke:#ff0000;stroke- > width:1.01005316;stroke-linecap:butt;stroke-linejoin:miter;stroke- > miterlimit:4;stroke-dasharray:2.02010632, 1.01005316;stroke- > dashoffset:0;stroke-opacity:1;marker-end:url(#marker4760)" > + d="m 325.70774,148.78714 v -32.84999 h -70.7012 v 30.70761" > + id="path4634" > + inkscape:connector-curvature="0" /> > + </g> > +</svg> > 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..c5bbd32 > --- /dev/null > +++ b/doc/guides/howto/pvp_reference_benchmark.rst > @@ -0,0 +1,395 @@ > +.. 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 a 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 without using > +external vSwitches (OVS, VPP, ...) to make it easier to obtain > +reproducible results and to facilitate continuous integration testing. > + > +The guide covers two ways of launching the VM, either by directly > +calling the QEMU command line, or by relying on libvirt. It has been > +tested with DPDK > +v16.11 using RHEL7 for both host and guest. > + > + > +Setup overview > +-------------- > + > +.. _figure_pvp_2nics: > + > +.. figure:: img/pvp_2nics.* > + > + PVP setup using 2 NICs > + > +In this diagram, each red arrow represents one logical core. This > +use-case requires 6 dedicated logical cores. A forwarding configuration > +with a single NIC is also possible, requiring 3 logical cores. > + > + > +Host setup > +---------- > + > +In this setup, we isolate 6 cores (from CPU2 to CPU7) on the same NUMA > +node. Two cores are assigned to the VM vCPUs running testpmd and four > +are assigned to testpmd on the host. > + > + > +Host tuning > +~~~~~~~~~~~ > + > +#. On BIOS, disable turbo-boost and hyper-threads. > + > +#. 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 or if BIOS is 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 > $i > + done > + > + > +Qemu build > +~~~~~~~~~~ > + > +Build Qemu: > + > + .. code-block:: console > + > + git clone git://git.qemu.org/qemu.git > + cd qemu > + mkdir bin > + cd bin > + ../configure --target-list=x86_64-softmmu > + > + > +DPDK build > +~~~~~~~~~~ > + > +Build DPDK: > + > + .. code-block:: console > + > + git clone git://dpdk.org/dpdk > + cd dpdk > + export RTE_SDK=$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:: > + > + The Sandy Bridge family seems to have some IOMMU limitations giving > poor > + performance results. To achieve good performance on these machines > + consider using UIO instead. > + > +#. Launch the 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 > + > +With this command, isolated CPUs 2 to 5 will be used as lcores for PMD > threads. > + > +#. In testpmd interactive mode, set the portlist to obtain the correct > port > + chaining: > + > + .. code-block:: console > + > + set portlist 0,2,1,3 > + start > + > + > +VM launch > +~~~~~~~~~ > + > +The VM may be launched either by calling QEMU directly, or by using > libvirt. > + > +#. Qemu way: > + > +Launch QEMU with two Virtio-net devices paired to the vhost-user > +sockets created by testpmd. Below example uses default Virtio-net > +options, but options may be specified, for example to disable mergeable > +buffers or indirect descriptors. > + > + .. 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$1-:22 -net nic \ > + -qmp unix:/tmp/qmp.socket,server,nowait \ > + -monitor stdio <vm_image>.qcow2 > + > +You can use this `qmp-vcpu-pin > +<https://patchwork.kernel.org/patch/9361617/>`_ > +script to pin vCPUs. > + > +It can be used as follows, for example to pin 3 vCPUs to CPUs 1, 6 and > +7, where isolated CPUs 6 and 7 will be used as lcores for Virtio PMDs: > + > + .. code-block:: console > + > + export PYTHONPATH=$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 permissive, since testpmd is > +generally run as root (note, as reboot is 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, the following snippet is an extract of he 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 the 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 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 > $i > + done > + > + > +DPDK build > +~~~~~~~~~~ > + > +Build DPDK: > + > + .. code-block:: console > + > + git clone git://dpdk.org/dpdk > + cd dpdk > + export RTE_SDK=$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 the 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 > + > +Results template > +---------------- > + > +Below template should be used when sharing results: > + > + .. code-block:: none > + > + Traffic Generator: <Test equipment (e.g. IXIA, Moongen, ...)> > + Acceptable Loss: <n>% > + Validation run time: <n>min > + Host DPDK version/commit: <version, SHA-1> > + Guest DPDK version/commit: <version, SHA-1> > + Patches applied: <link to patchwork> > + QEMU version/commit: <version> > + Virtio features: <features (e.g. mrg_rxbuf='off', leave empty if > default)> > + CPU: <CPU model>, <CPU frequency> > + NIC: <NIC model> > + Result: <n> Mpps > -- > 2.9.3
