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#1 2023-07-26 10:05:52
- train__wreck
- Member
- Registered: 2020-08-23
- Posts: 32
IPerf3 retries
Hello, I have recently done a test between 2 Arch desktop PCs using IPerf3. The machines both have gigabit ethernet adapters, a Realtek R8125 in one and an Intel PRO/1000 MT in the other, with 2 gigabit switches in between. I notice retries during the test:
Connecting to host 172.16.16.23, port 5201
[ 5] local 172.16.16.10 port 55062 connected to 172.16.16.23 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 113 MBytes 951 Mbits/sec 27 140 KBytes
[ 5] 1.00-2.00 sec 112 MBytes 939 Mbits/sec 27 133 KBytes
[ 5] 2.00-3.00 sec 112 MBytes 937 Mbits/sec 24 202 KBytes
[ 5] 3.00-4.00 sec 112 MBytes 939 Mbits/sec 27 201 KBytes
[ 5] 4.00-5.00 sec 112 MBytes 942 Mbits/sec 27 191 KBytes
[ 5] 5.00-6.00 sec 112 MBytes 938 Mbits/sec 27 208 KBytes
[ 5] 6.00-7.00 sec 112 MBytes 938 Mbits/sec 27 136 KBytes
[ 5] 7.00-8.00 sec 112 MBytes 940 Mbits/sec 27 136 KBytes
[ 5] 8.00-9.00 sec 112 MBytes 939 Mbits/sec 27 136 KBytes
[ 5] 9.00-10.00 sec 112 MBytes 939 Mbits/sec 24 192 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 1.09 GBytes 940 Mbits/sec 264 sender
[ 5] 0.00-10.00 sec 1.09 GBytes 939 Mbits/sec receiver
iperf Done.The amount of retries is pretty much the same every time I run the test. Apparently retries are dropped packets? I have left a continuous ping overnight between the machines and the next morning it had 0% loss. I do not notice any other issues with the network. I tried different cabling but it did not change anything. Is this worth investigating further? Thanks.
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#2 2023-07-26 12:31:01
- seth
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- Registered: 2012-09-03
- Posts: 60,792
Re: IPerf3 retries
Are you using the realtek chip w/ https://aur.archlinux.org/packages/r8125 or the r8169 module?
https://bugzilla.kernel.org/show_bug.cgi?id=207205
https://bugzilla.kernel.org/show_bug.cgi?id=217596
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#3 2023-07-27 04:47:50
- train__wreck
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- Registered: 2020-08-23
- Posts: 32
Re: IPerf3 retries
I am using the r8169 module. I dug out an old Intel PRO1000 PCIe adapter and tried using it instead of the Realtek, the IPerf retries are still there in identical numbers.
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#4 2023-07-27 06:44:18
- seth
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- Registered: 2012-09-03
- Posts: 60,792
Re: IPerf3 retries
Is your only concern the retransmits (not "retries")?
Cable, maybe the switch.
You can also try https://wiki.archlinux.org/title/Networ … eue_length
Carefully or you can just ramp it up to the "default" of 9000, but as pointed out it must be supported by all devices.
"ping" sends significatly smaller packages at a very low rate, so there's no stress on the infrastructure at all.
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