I wonder if the issue was caused by a different window size used by iperf3 vs iperf2. Maybe, worth trying again iperf3 passing the same window size as iperf2. To do that you need to pass the "-w" option on the command line of iperf2/3. I think it's worth giving it a try...
- Marco On Mon, 2018-03-05 at 18:22 +0000, Hao Fu (haof) wrote: > Solved by using iperf2 instead. > > > From: <vpp-dev@lists.fd.io> on behalf of "Hao Fu (haof)" <h...@cisco.com> > > Date: Friday, March 2, 2018 at 11:23 AM > > To: "vpp-dev@lists.fd.io" <vpp-dev@lists.fd.io> > > Subject: [vpp-dev] Dramatic dropping caused by VPP? > > > > > Dear All, > > I created two vms with vpp installed and connected them with host-net. No drop > was observed between the two vms with Iperf3. > > I then leverage tap to make the vms talk through vpp. > In vm compute0: [host 123.0.1.1/24]—tap—[123.0.1.2/24, GigabitEthernet0/8/0 > (up) 192.167.1.1/24 vpp] > In vm compute1: [host 123.0.2.1/24]---tap---[123.0.2.2/24, > GigabitEthernet0/8/0 (up): 192.167.1.2/24 vpp]. > > Now I can see dramatic drops after calling the cmd “iperf3 -c 123.0.2.1 -u -b > 1g”: > Accepted connection from 123.0.1.1, port 59798 > [ 5] local 123.0.2.1 port 5201 connected to 123.0.1.1 port 57969 > [ ID] Interval Transfer Bandwidth Jitter Lost/Total > Datagrams > [ 5] 0.00-1.01 sec 11.6 MBytes 96.5 Mbits/sec 0.088 ms 12300/13783 > (89%) > [ 5] 1.01-2.00 sec 16.0 MBytes 135 Mbits/sec 0.042 ms 13696/15739 > (87%) > [ 5] 2.00-3.00 sec 31.0 MBytes 260 Mbits/sec 0.034 ms 11529/15498 > (74%) > [ 5] 3.00-4.02 sec 12.9 MBytes 106 Mbits/sec 0.048 ms 13361/15009 > (89%) > [ 5] 4.02-5.01 sec 11.5 MBytes 97.5 Mbits/sec 0.065 ms 13925/15400 > (90%) > [ 5] 5.01-6.00 sec 11.2 MBytes 94.9 Mbits/sec 0.038 ms 13521/14958 > (90%) > [ 5] 6.00-7.00 sec 19.4 MBytes 162 Mbits/sec 0.043 ms 12867/15350 > (84%) > [ 5] 7.00-8.00 sec 25.7 MBytes 216 Mbits/sec 0.024 ms 12026/15312 > (79%) > [ 5] 8.00-9.02 sec 21.4 MBytes 177 Mbits/sec 0.035 ms 12529/15268 > (82%) > [ 5] 9.02-10.02 sec 17.4 MBytes 146 Mbits/sec 0.048 ms 12957/15189 > (85%) > [ 5] 10.02-10.04 sec 0.00 Bytes 0.00 bits/sec 0.048 ms 0/0 (-nan%) > > Any advice and suggestions will be greatly appreciated. > > Thanks, > Hao > > > > > > > > > > -- Marco V SUSE LINUX GmbH | GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) Maxfeldstr. 5, D-90409, Nürnberg
