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netperf UDP_STREAM high packet loss on QEMU tap network
Hi, I boot a guest with "-netdev tap,id=hn0,vhost=off,br=br0,helper=/usr/local/libexec/qemu-bridge-helper" network option, and using "netperf -H IP -t UDP_STREAM" to test guest UDP performance, I got the following output:
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # 10^6bits/sec
212992 65507 10.00 144710 0 7583.56
212992 10.00 32 1.68
We can find most of UDP packets are lost. But I test another host machine or use "-netdev usr,xxxxx". I can got:
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # 10^6bits/sec
212992 65507 10.00 18351 0 961.61
212992 10.00 18350 961.56
most of UDP packets are recived.
And If we check the tap qemu used, we can see:
ifconfig tap0
tap0: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST> mtu 1500
inet6 fe80::ecc6:21ff:fe6f:b174 prefixlen 64 scopeid 0x20<link>
ether ee:c6:21:6f:b1:74 txqueuelen 1000 (Ethernet)
RX packets 282 bytes 30097 (29.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 9086214 bytes 12731596673 (11.8 GiB)
TX errors 0 dropped 16349024 overruns 0 carrier 0 collisions 0
lots of TX packets are dropped.
list other packet size:
➜ boot netperf -H 192.168.199.200 -t UDP_STREAM -- -m 1
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.199.200 () port 0 AF_INET
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # 10^6bits/sec
212992 1 10.00 2297941 0 1.84
212992 10.00 1462024 1.17
➜ boot netperf -H 192.168.199.200 -t UDP_STREAM -- -m 128
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.199.200 () port 0 AF_INET
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # 10^6bits/sec
212992 128 10.00 2311547 0 236.70
212992 10.00 1359834 139.25
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