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Diffstat (limited to 'results/scraper/launchpad-without-comments/1920871')
| -rw-r--r-- | results/scraper/launchpad-without-comments/1920871 | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/1920871 b/results/scraper/launchpad-without-comments/1920871 new file mode 100644 index 00000000..7eda7583 --- /dev/null +++ b/results/scraper/launchpad-without-comments/1920871 @@ -0,0 +1,51 @@ +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 \ No newline at end of file |