[ovs-discuss] [help]Question about tcp higher retansmition rate during iperf test
txfh2007
txfh2007 at aliyun.com
Thu Apr 4 09:48:30 UTC 2019
Hi all:
I'm testing ovs-dpdk performance. the test environment is as below: VM1(2u2g) and VM2(2u2g) on same host, image is centos 7.2, iperf test shows high tcp retransmition rate as follows. But when I use native-ovs in the same environment, the retransmition rate is under 100.
So what should I do to Reduce retransmission rate ? I guess the kernel parameter should be adjusted when using dpdk-ovs ?
Thanks for help
Timo
dpdk-ovs:
[ 4] 72.00-73.00 sec 573 MBytes 4.81 Gbits/sec 1206 197 KBytes
[ 4] 73.00-74.00 sec 559 MBytes 4.70 Gbits/sec 1287 361 KBytes
[ 4] 74.00-75.00 sec 555 MBytes 4.66 Gbits/sec 968 430 KBytes
[ 4] 75.00-76.00 sec 563 MBytes 4.72 Gbits/sec 916 444 KBytes
[ 4] 76.00-77.00 sec 480 MBytes 4.02 Gbits/sec 841 402 KBytes
[ 4] 77.00-77.22 sec 91.5 MBytes 3.50 Gbits/sec 764 173 KBytes
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-77.22 sec 41.3 GBytes 4.59 Gbits/sec 76413 sender
[ 4] 0.00-77.22 sec 0.00 Bytes 0.00 bits/sec receiver
native-ovs:
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 1.07 GBytes 9.22 Gbits/sec 0 2.96 MBytes
[ 4] 1.00-2.00 sec 1.09 GBytes 9.39 Gbits/sec 0 3.02 MBytes
[ 4] 2.00-3.00 sec 1.09 GBytes 9.39 Gbits/sec 0 3.02 MBytes
[ 4] 3.00-4.00 sec 1.09 GBytes 9.39 Gbits/sec 0 3.02 MBytes
[ 4] 4.00-4.45 sec 499 MBytes 9.38 Gbits/sec 0 3.02 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-4.45 sec 4.84 GBytes 9.35 Gbits/sec 0 sender
[ 4] 0.00-4.45 sec 0.00 Bytes 0.00 bits/sec receiver
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