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Standard User Croftie2
(learned) Sat 09-Aug-25 15:20:08
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Re: What are your upload speeds like?


[re: Chrysalis] [link to this post] 		 
Brill thanks. Looks like packet reordering is the issue. It's suggested to try iperf in udp mode and sure enough speed is higher and stable. Not the best but I'd take it for the remainder of the contract rather than trying to get out of it or moaning for the next 12 months..

UDP
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iperf3 -u -c speedtest.idnet.net -b 2500M
Connecting to host speedtest.idnet.net, port 5201[  5] local 192.168.1.6 port 65096 connected to 212.69.36.111 port 5201
[ ID] Interval           Transfer     Bitrate         Total Datagrams[  5]   0.00-1.00   sec  82.0 MBytes   688 Mbits/sec  59204
[  5]   1.00-2.00   sec  82.7 MBytes   694 Mbits/sec  59721[  5]   2.00-3.00   sec  83.2 MBytes   698 Mbits/sec  60090
[  5]   3.00-4.00   sec  83.4 MBytes   700 Mbits/sec  60238[  5]   4.00-5.00   sec  83.3 MBytes   699 Mbits/sec  60158
[  5]   5.00-6.00   sec  83.8 MBytes   703 Mbits/sec  60500[  5]   6.00-7.00   sec  83.5 MBytes   701 Mbits/sec  60315
[  5]   7.00-8.00   sec  83.8 MBytes   703 Mbits/sec  60502[  5]   8.00-9.00   sec  83.5 MBytes   700 Mbits/sec  60295
[  5]   9.00-10.00  sec  83.8 MBytes   703 Mbits/sec  60498- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total Datagrams[  5]   0.00-10.00  sec   833 MBytes   699 Mbits/sec  0.000 ms  0/601521 (0%)  sender
[  5]   0.00-10.01  sec   831 MBytes   697 Mbits/sec  0.019 ms  1280/601521 (0.21%)  receiver


TCP
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iperf3 -c speedtest.idnet.net
Connecting to host speedtest.idnet.net, port 5201[  5] local 192.168.1.6 port 55753 connected to 212.69.36.111 port 5201
[ ID] Interval           Transfer     Bitrate[  5]   0.00-1.00   sec   142 MBytes  1.19 Gbits/sec
[  5]   1.00-2.00   sec  36.8 MBytes   307 Mbits/sec[  5]   2.00-3.00   sec  21.8 MBytes   183 Mbits/sec
[  5]   3.00-4.00   sec  31.6 MBytes   265 Mbits/sec[  5]   4.00-5.00   sec  22.9 MBytes   193 Mbits/sec
[  5]   5.00-6.00   sec  28.4 MBytes   237 Mbits/sec[  5]   6.00-7.00   sec  41.2 MBytes   346 Mbits/sec
[  5]   7.00-8.01   sec  33.0 MBytes   274 Mbits/sec[  5]   8.01-9.00   sec  17.4 MBytes   147 Mbits/sec
[  5]   9.00-10.00  sec  20.9 MBytes   176 Mbits/sec- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate[  5]   0.00-10.00  sec   396 MBytes   333 Mbits/sec                  sender
[  5]   0.00-10.01  sec   389 MBytes   326 Mbits/sec                  receiver


Still need to try a newer OS.

I'll go back to idnet and see what they say. I wonder if the excessive packet reordering is caused when handing over from zen to cityfibre national and moving to zen backhaul would fix it. Although they still have to hand back at the FeX.
Standard User tboorman
(fountain of knowledge) Sat 09-Aug-25 16:11:39
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Re: What are your upload speeds like?


[re: Croftie2] [link to this post] 		 
Apologies for the delayed response.

I'm not on CityFibre, unfortunately - I just wanted to mention that Zen's backhaul does route to IDNet's handover point at Telehouse.
Standard User Chrysalis
(legend) Sat 09-Aug-25 16:16:04
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Re: What are your upload speeds like?


[re: Croftie2] [link to this post] 		 
Yeah sorry I couldnt find it the first time, I am curious what Idnet are doing, sadly when it comes to these type of parallel processing feature sets, binding sessions to one path is optional, and the resource gains are lower in that mode. But it also could be down to something unrelated.

How I came across that page I was investigating some reordering issues I believe were affecting me, which turned out it was my Realtek NIC, replaced it with an i210 and the problem vanished, although it was not as extreme as you are witnessing.

I just tried to run the iperf you have been testing with but I am guessing the iperf server is locked down to idnet's ip range which is sensible.

AAISP have one, but I can only run it in tcp mode, it gets 950mbps.

For clarity I am over CityFibre. 


					
Edited by Chrysalis (Sat 09-Aug-25 16:16:30)

				

			
						
			

			
			

				
					

			
						
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				Standard User jalzoo
(learned)
				Sat 09-Aug-25 16:48:29
					
						
			

			

				
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Re: What are your upload speeds like?
 

			 [re: Croftie2] [link to this post]
					
			
			 
							
						

					

						
			

			

			
				

					UDP Maxes out upload:




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C:\Users\jamie\OneDrive\Desktop\iperf3.19_64>iperf3 -u -c speedtest.idnet.net -b 2500M
Connecting to host speedtest.idnet.net, port 5201[  5] local 192.168.1.63 port 63405 connected to 212.69.36.111 port 5201
[ ID] Interval           Transfer     Bitrate         Total Datagrams[  5]   0.00-1.00   sec   284 MBytes  2.37 Gbits/sec  204901
[  5]   1.00-2.01   sec   285 MBytes  2.37 Gbits/sec  206050[  5]   2.01-3.01   sec   281 MBytes  2.37 Gbits/sec  202723
[  5]   3.01-4.01   sec   284 MBytes  2.37 Gbits/sec  204967[  5]   4.01-5.00   sec   280 MBytes  2.37 Gbits/sec  202304
[  5]   5.00-6.01   sec   285 MBytes  2.37 Gbits/sec  205616[  5]   6.01-7.00   sec   281 MBytes  2.37 Gbits/sec  202695
[  5]   7.00-8.01   sec   285 MBytes  2.37 Gbits/sec  205907[  5]   8.01-9.00   sec   281 MBytes  2.37 Gbits/sec  202945

					
					
				

			
						
			

			
			

				
					

						

							
			
				Standard User candlerb
(knowledge is power)
				Sun 10-Aug-25 11:18:00
					
						
			

			

				
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Re: What are your upload speeds like?
 

			 [re: jalzoo] [link to this post]
					
			
			 
							
						

					

						
			

			

			
				

					
In reply to a post by jalzoo:
UDP Maxes out upload:


That's to be expected, bar some gross problem with your router.



However, what would be far more interesting is to run a UDP iperf test at *less* than your maximum speed - say 1Gbps - and measure how many packets arrive compared to the number sent - but I'm not sure if iperf3 will tell you that.



If those are 1500 byte packets then 1Gbps is about 83K packets per second. If you see around 1 packet dropped per second, this is strong confirmation of low-level packet loss at a level which will cause a single TCP stream to back off to the levels you've been seeing.



Then try reducing the packet size to 750 bytes, so you get double the packets per second (~167K packets per second; note that this is increasing the load on your host and router).



If the packet loss doubles, then this implies a packet-level problem, e.g. microbursts overflowing fixed size buffers. If the packet loss stays about the same, then it implies a problem with bit error rate, e.g. a dirty fibre connection (the packets are half the size, so the chance of an individual packet being corrupted is half).
					
					
				

			
						
			

			
			

				
					

						

							
			
				Standard User candlerb
(knowledge is power)
				Sun 10-Aug-25 12:18:27
					
						
			

			

				
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Re: What are your upload speeds like?
 

			 [re: candlerb] [link to this post]
					
			
			 
							
						

					

						
			

			

			
				

					Update: yes, it does tell you packet loss.



Here's a test done at 10M upload (my link is 330/50) on a public iperf3 server:




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# iperf3 -4 -c speedtest-mer-a.mythic-beasts.com -p 5201-5205 -u -b 10M
Connecting to host speedtest-mer-a.mythic-beasts.com, port 5201[  5] local 10.12.255.13 port 59431 connected to 93.93.134.56 port 5201
[ ID] Interval           Transfer     Bitrate         Total Datagrams[  5]   0.00-1.00   sec  1.19 MBytes  10.0 Mbits/sec  867
[  5]   1.00-2.00   sec  1.19 MBytes  9.99 Mbits/sec  866[  5]   2.00-3.00   sec  1.19 MBytes  10.0 Mbits/sec  867
[  5]   3.00-4.00   sec  1.19 MBytes  10.0 Mbits/sec  867[  5]   4.00-5.00   sec  1.19 MBytes  10.0 Mbits/sec  867
[  5]   5.00-6.00   sec  1.19 MBytes  10.0 Mbits/sec  867[  5]   6.00-7.00   sec  1.19 MBytes  10.0 Mbits/sec  867
[  5]   7.00-8.00   sec  1.19 MBytes  10.0 Mbits/sec  867[  5]   8.00-9.00   sec  1.19 MBytes  9.99 Mbits/sec  866
[  5]   9.00-10.00  sec  1.19 MBytes  10.0 Mbits/sec  867- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total Datagrams[  5]   0.00-10.00  sec  11.9 MBytes  10.0 Mbits/sec  0.000 ms  0/8668 (0%)  sender
[  5]   0.00-10.04  sec  11.9 MBytes  9.96 Mbits/sec  0.037 ms  0/8667 (0%)  receiver 
iperf Done.




Zero lost datagrams is the key indication here, although I don't know why sender and receiver don't exactly agree on the number of datagrams.



I suggest you use the IDNet test server, crank it up to 1G, and see what you get.
					
					
				

			
						
			

			
			

				
					

						

							
			
				Standard User tboorman
(fountain of knowledge)
				Mon 11-Aug-25 11:02:04
					
						
			

			

				
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Re: What are your upload speeds like?
 

			 [re: Croftie2] [link to this post]
					
			
			 
							
						

					

						
			

			

			
				

					
In reply to a post by Croftie2:
No problem thanks for looking. On W10 but will try live booting linux.




Have you tested it using a Linux distro yet?
					
					
				

			
						
			

			
			

				
					

						

							
			
				Standard User jalzoo
(learned)
				Mon 25-Aug-25 15:07:48
					
						
			

			

				
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Re: What are your upload speeds like? *DELETED*
 

			 [re: tboorman] [link to this post]
					
			
			 
							
						

					

						
			

			

			
				

					Post deleted by jalzoo
					
					
Edited by jalzoo (Tue 26-Aug-25 00:18:31)

				

			
						
			

			
			

				
					

						

							
			
				Standard User derbynet
(newbie)
				Fri 29-Aug-25 08:20:20
					
						
			

			

				
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Re: What are your upload speeds like?
 

			 [re: Chrysalis] [link to this post]
					
			
			 
							
						

					

						
			

			

			
				

					Always nice to see my posts elsewhere make it onto other forums. 

Yes, the resolution for me was to install Windows 11, as Microsoft never ported the improvements to the TCP stack back to 10, and never plan to.
					
					
				

			
						
			

			
			

					
		

	

	
	

		

			
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