-----Original Message-----
From: dev <dev-bounces at dpdk.org> on behalf of Abhishek Mahajan
<abhishek.maha...@aricent.com>
Date: Monday, July 4, 2016 at 7:27 AM
To: "dev at dpdk.org" <dev at dpdk.org>
Cc: "Addepalli, Srinivasa R" <srinivasa.r.addepalli at intel.com>, "Shivastava,
RakeshX" <rakeshx.shivastava at intel.com>
Subject: [dpdk-dev] Low packet generation rate of 526kpps using pktgen-dpdk
from inside VM
Hi,
With pktgen-dpdk inside VM, it is observed that packet TX rate (526Kpps with
64byte size) is very low. How can higher packet rates be achieved ?
On enabling logs of virtio pmd in DPDK, getting following logs in syslogs:
PMD: virtio_xmit_pkts() tx: No free tx descriptors to transmit
Two PC setup having configuration as follow:
-> Xeon Processor : Intel(R) Xeon(R) CPU E5-2603 v3 @ 1.60GHz having 6 cores.
-> RAM : 16GB
->One PC is generating traffic other is receiving the packets using pktgen
tool. The two PC are connected directly with 10G Ethernet interface.
Generation side PC - Host
-> 2 cores dedicated to OVS-DPDK
-> 1 core is free for Linux kernel
-> OS: Ubuntu 14.04
-> Linux kernel : 3.13.0-85-generic
-> DPDK version : 2.2.0
-> OVS version : 2.5.0
-> VFIO driver for port binding
VM - Total 3 cores
-> 2 cores for pktgen
-> 1 core for Linux kernel
-> OS: Ubuntu 15.04
-> Linux kernel : 3.19.8
-> DPDK version : 16.04
-> Pktgen version : 3.0.00
-> UIO driver for port binding
DPDK, OVS and pktgen are build using - x86_64-ivshmen-linuxapp-gcc option.
VM launched through following Qemu command :
* qemu-system-x86_64 --enable-kvm -smp 3 -cpu host -m 2048 -chardev
socket,id=charnet0,path=/var/run/openvswitch/vhost-user1 -netdev
type=vhost-user,id=hostnet0,chardev=charnet0,vhostforce=on -device
virtio-net-pci,netdev=hostnet0,mac=16:fa:13:26:31:1b -object
memory-backend-file,id=mem,size=2048M,mem-path=/dev/hugepages,share=on -numa
node,memdev=mem -mem-prealloc -hda /home/aricent/ubuntu_15_04.img
Pktgen is launched using following command:
Pktgen -c -0x3 -n 4 -m 512 -b 000:00:04.0 - p 0x3 -t -m
"[1:1].0"
KW: I do not think this is Pktgen problem, but please try pktgen ?c 0x6 ?n 4 ?m
512 ?b 0000:00:04.0 -- -T ?m?[2:2].0?
Core 0 needs to be left alone for Linux and core 1 is used for Pktgen display
and core 2 is used for Rx/Tx on port 0.
OVS command used:
* /usr/sbin/ovs-vswitchd --dpdk -c 0xc -n 4 -m 2048 --
unix:/var/run/openvswitch/db.sock -vconsole:emer -vsyslog:err -vfile:info
--mlockall --no-chdir --log-file=/var/log/openvswitch/ovs-vswitchd.log
--pidfile=/var/run/openvswitch/ovs-vswitchd.pid --detach -monitor
Thanks & Regards
Abhishek
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