[dpdk-users] 1518B of 1G NIC can't achieve 100% throughput
MESSI SHIYEH
shiyehgo at gmail.com
Wed Oct 12 10:20:28 CEST 2016
Hi all,
I have a bay trail platform as shown below:
===============================================
|| Atom N2807 --> PCIE Switch --> Intel I210 --> RJ45 Eth1 ||
|| |
||
|| | --> Intel I210 -->
RJ45 Eth2 ||
===============================================
Now I run RFC2544 throughput test for Linux native ip forwarding,
and get the result as show below:
================================
|| Frame Size(bytes) || Throughput(%) ||
|| 1518 || 100 ||
================================
Focus on 1518B, the throughput is totally 100%.
However, I run RFC2544 test with DPDK (testpmd),
and here is the result.
================================
|| Frame Size(bytes) || Throughput(%) ||
|| 1518 || 99.297 ||
================================
(My command is: #./testpmd -c 0x3 -n 1 -- -i --nb-cores=1 --nb-ports=2
--total-num-mbufs=2048)
The throughput of 1518B is just only 99.297%,
which means it is failed when running 100% offered loading because there is
a few frame loss (~0.5%).
Could anyone help us to explain the phenomenon?
Could anyone help us to improve it to 100%?
BTW, I just attempted to modify these parameters like rxd, txd, txwt,
burst, etc,..
but it doesn't seem work to me.
PS.
OS: CentOS 7.1 x64
Kernel: 3.10.0-229
DPDK ver: 16.04
BR,
Leo,
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