Hi Joseph, Thanks for your response, to answer your questions. We are running a windows VM in our core and at each branch site. UDP to the 5km site is quite low also though we can get 900mb TCP. [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 4] 0.00-10.00 sec 449 MBytes 376 Mbits/sec 0.114 ms 0/57430 (0%) If I do a UDP test in reverse to the 5km site I get a ton of out of order packets and lost traffic. [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 4] 0.00-10.01 sec 982 MBytes 823 Mbits/sec 152.103 ms 116433/125507 (93%) [SUM] 0.0-10.0 sec 2255 datagrams received out-of-order UDP from our data centre to 500km site shows very little lost traffic: [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 4] 0.00-10.00 sec 456 MBytes 382 Mbits/sec 0.119 ms 167/58360 (0.29%) If I do the reverse towards our data centre there is lost packets. [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 4] 0.00-10.00 sec 477 MBytes 400 Mbits/sec 0.043 ms 14386/61014 (24%)
All of the circuits are Carrier Ethernet. Shouldn't we expect to see lost traffic as this is UDP?
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Hi Guys, I need some advise here, we have a 1gb circuit between site A and site B (500km distance) which we are told is underperforming. Through iPerf testing I have found that for a standard TCP test with no extra parameters, we only hit a maximum of 160 Mbits/sec. iperf3 -c x.x.x.x [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 139 MBytes 116 Mbits/sec sender [ 4] 0.00-10.00 sec 139 MBytes 116 Mbits/sec receiver This is a point to point fibre circuit terminated on one end by a Nexus 9k and a 4431 with 1gb throughput license at the remote end (I do understand that the throughput license is cumulative). Pings across the /30 interfaces have a 10ms response time which seems reasonable for the distance. If I send 10 parallel streams or set a windows size of 2mb we can get around 650-800 Mbits/sec. iperf3 -c x.x.x.x -P 10 [ ID] Interval Transfer Bandwidth
[SUM] 0.00-10.00 sec 896 MBytes 751 Mbits/sec sender [SUM] 0.00-10.00 sec 895 MBytes 751 Mbits/sec receiver iperf3 -c x.x.x.x -W 2000000 [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 926 MBytes 777 Mbits/sec sender [ 4] 0.00-10.00 sec 925 MBytes 776 Mbits/sec receiver
UDP iPerf transfers will not get above 500 Mbits/sec: iperf3 -c x.x.x.x -u -b 1000m
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 4] 0.00-10.00 sec 555 MBytes 465 Mbits/sec 0.050 ms 15182/71009 (21%) The same test to a site 5km (5ms ping) away will get speeds of 900 Mbits/sec from a single stream without the need to manipulate the window size or add parallel streams. We also have two 200mb circuits in this location (500km away) and they also see iPerf TCP results of up to 160 Mbits/sec, but this is close to the full bandwidth of 200mb.
So my question is, should we be able to get a faster transmission with a single stream over this distance? does 160 Mbits/sec seem low for a 1gb line? are our expectations too high?
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