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<a id="changeset-link" style="font-size:14px;font-weight:600;color:#0068FF;font-size: 14px; color: #0068FF; font-weight: 600;" href="https://github.com/ovsrobot/ovs/commit/614c12b31217">614c12b CHANGESET →</a>
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<p id="commit-message" style="margin:0px;font-family:cousine, monospace;font-size:14px;line-height:22px;font-family: cousine, monospace; font-size: 14px; text-align: left; line-height: 22px;">userspace: fix bad UDP performance issue of veth<br><br>iperf3 UDP performance of veth to veth case is<br>very very bad because of too many packet loss,<br>the root cause is rmem_default and wmem_default<br>are just 212992, but iperf3 UDP test used 8K<br>UDP size which resulted in many UDP fragment in<br>case that MTU size is 1500, one 8K UDP send would<br>enqueue 6 UDP fragments to socket receive queue,<br>the default small socket buffer size can't cache<br>so many packets that many packets are lost.<br><br>This commit fixed packet loss issue, it set socket<br>receive and send buffer to maximum possible value,<br>therefore there will not be packet loss forever,<br>this also helps improve TCP performance because of<br>no retransmit.<br><br>By the way, big socket buffer doesn't mean it will<br>allocate big buffer on creating socket, actually<br>it won't alocate any extra buffer compared to default<br>socket buffer size, it just means more skbuffs can<br>be enqueued to socket receive queue and send queue,<br>therefore there will not be packet loss.<br><br>The below is for your reference.<br><br>The result before apply this commit<br>===================================<br>$ ip netns exec ns02 iperf3 -t 5 -i 1 -u -b 100M -c 10.15.2.6 --get-server-output -A 5<br>Connecting to host 10.15.2.6, port 5201<br>[ 4] local 10.15.2.2 port 59053 connected to 10.15.2.6 port 5201<br>[ ID] Interval Transfer Bandwidth Total Datagrams<br>[ 4] 0.00-1.00 sec 10.8 MBytes 90.3 Mbits/sec 1378<br>[ 4] 1.00-2.00 sec 11.9 MBytes 100 Mbits/sec 1526<br>[ 4] 2.00-3.00 sec 11.9 MBytes 100 Mbits/sec 1526<br>[ 4] 3.00-4.00 sec 11.9 MBytes 100 Mbits/sec 1526<br>[ 4] 4.00-5.00 sec 11.9 MBytes 100 Mbits/sec 1526<br>- - - - - - - - - - - - - - - - - - - - - - - - -<br>[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams<br>[ 4] 0.00-5.00 sec 58.5 MBytes 98.1 Mbits/sec 0.047 ms 357/531 (67%)<br>[ 4] Sent 531 datagrams<br><br>Server output:<br>-----------------------------------------------------------<br>Accepted connection from 10.15.2.2, port 60314<br>[ 5] local 10.15.2.6 port 5201 connected to 10.15.2.2 port 59053<br>[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams<br>[ 5] 0.00-1.00 sec 1.36 MBytes 11.4 Mbits/sec 0.047 ms 357/531 (67%)<br>[ 5] 1.00-2.00 sec 0.00 Bytes 0.00 bits/sec 0.047 ms 0/0 (-nan%)<br>[ 5] 2.00-3.00 sec 0.00 Bytes 0.00 bits/sec 0.047 ms 0/0 (-nan%)<br>[ 5] 3.00-4.00 sec 0.00 Bytes 0.00 bits/sec 0.047 ms 0/0 (-nan%)<br>[ 5] 4.00-5.00 sec 0.00 Bytes 0.00 bits/sec 0.047 ms 0/0 (-nan%)<br><br>iperf Done.<br><br>The result after apply this commit<br>===================================<br>$ sudo ip netns exec ns02 iperf3 -t 5 -i 1 -u -b 4G -c 10.15.2.6 --get-server-output -A 5<br>Connecting to host 10.15.2.6, port 5201<br>[ 4] local 10.15.2.2 port 48547 connected to 10.15.2.6 port 5201<br>[ ID] Interval Transfer Bandwidth Total Datagrams<br>[ 4] 0.00-1.00 sec 440 MBytes 3.69 Gbits/sec 56276<br>[ 4] 1.00-2.00 sec 481 MBytes 4.04 Gbits/sec 61579<br>[ 4] 2.00-3.00 sec 474 MBytes 3.98 Gbits/sec 60678<br>[ 4] 3.00-4.00 sec 480 MBytes 4.03 Gbits/sec 61452<br>[ 4] 4.00-5.00 sec 480 MBytes 4.03 Gbits/sec 61441<br>- - - - - - - - - - - - - - - - - - - - - - - - -<br>[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams<br>[ 4] 0.00-5.00 sec 2.30 GBytes 3.95 Gbits/sec 0.024 ms 0/301426 (0%)<br>[ 4] Sent 301426 datagrams<br><br>Server output:<br>-----------------------------------------------------------<br>Accepted connection from 10.15.2.2, port 60320<br>[ 5] local 10.15.2.6 port 5201 connected to 10.15.2.2 port 48547<br>[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams<br>[ 5] 0.00-1.00 sec 209 MBytes 1.75 Gbits/sec 0.021 ms 0/26704 (0%)<br>[ 5] 1.00-2.00 sec 258 MBytes 2.16 Gbits/sec 0.025 ms 0/32967 (0%)<br>[ 5] 2.00-3.00 sec 258 MBytes 2.16 Gbits/sec 0.022 ms 0/32987 (0%)<br>[ 5] 3.00-4.00 sec 257 MBytes 2.16 Gbits/sec 0.023 ms 0/32954 (0%)<br>[ 5] 4.00-5.00 sec 257 MBytes 2.16 Gbits/sec 0.021 ms 0/32937 (0%)<br>[ 5] 5.00-6.00 sec 255 MBytes 2.14 Gbits/sec 0.026 ms 0/32685 (0%)<br>[ 5] 6.00-7.00 sec 254 MBytes 2.13 Gbits/sec 0.025 ms 0/32453 (0%)<br>[ 5] 7.00-8.00 sec 255 MBytes 2.14 Gbits/sec 0.026 ms 0/32679 (0%)<br>[ 5] 8.00-9.00 sec 255 MBytes 2.14 Gbits/sec 0.022 ms 0/32669 (0%)<br><br>iperf Done.<br><br>Signed-off-by: Yi Yang <yangyi01@inspur.com><br>Signed-off-by: 0-day Robot <robot@bytheb.org></p>
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