F5F Stay Refreshed Power Users Networks Speed decreases in one direction only during LAN transfer.

Speed decreases in one direction only during LAN transfer.

Speed decreases in one direction only during LAN transfer.

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ColSpeed
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10-01-2023, 09:59 PM
#1
You’ve installed fresh cables and hardware, but your main PC is experiencing slower performance. While full data transfers reach 1Gb/s, actual data throughput drops to about 700Mb/s. Your iperf tests on the switch showed both servers handling full speeds, suggesting the issue isn’t with the server side. The problem likely lies in the cable itself, possibly due to tight bends or damage. Consider running additional tests or inspecting the cables more closely to confirm.
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ColSpeed
10-01-2023, 09:59 PM #1

You’ve installed fresh cables and hardware, but your main PC is experiencing slower performance. While full data transfers reach 1Gb/s, actual data throughput drops to about 700Mb/s. Your iperf tests on the switch showed both servers handling full speeds, suggesting the issue isn’t with the server side. The problem likely lies in the cable itself, possibly due to tight bends or damage. Consider running additional tests or inspecting the cables more closely to confirm.

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eruraion
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10-01-2023, 11:40 PM
#2
either it's a network device being weird in some way, or you're hitting some other limit inside one of the machines (for example, a storage bottleneck)
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eruraion
10-01-2023, 11:40 PM #2

either it's a network device being weird in some way, or you're hitting some other limit inside one of the machines (for example, a storage bottleneck)

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ITz_NoY
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10-09-2023, 01:57 PM
#3
I completed final speed tests using iperf; storage isn’t the problem. However, iperf indicated even slower speeds compared to SSD-to-SSD transfers (~40Mb/s slower on iperf). The tests were run from my Windows PC to two different Linux machines, yielding similar results—neither machine appears to be the cause unless Windows is behaving oddly.
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ITz_NoY
10-09-2023, 01:57 PM #3

I completed final speed tests using iperf; storage isn’t the problem. However, iperf indicated even slower speeds compared to SSD-to-SSD transfers (~40Mb/s slower on iperf). The tests were run from my Windows PC to two different Linux machines, yielding similar results—neither machine appears to be the cause unless Windows is behaving oddly.

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IxMoNsTeR_GD
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10-14-2023, 09:44 AM
#4
You just solved it! It seems Windows might be acting odd with Iperf.
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IxMoNsTeR_GD
10-14-2023, 09:44 AM #4

You just solved it! It seems Windows might be acting odd with Iperf.

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ChazmanC98
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10-25-2023, 08:38 AM
#5
The same performance metrics appear across different methods: file transfer via Windows Explorer, uploading through a locally hosted website, and using iperf on WSL Ubuntu. This suggests the problem isn't limited to a single tool. My doubt about it being a cable issue stems from expecting a noticeable drop in speed if the connection couldn’t handle full gigabit traffic in both directions, or if the disparity were even greater. The managed switch on one side is showing 1000Full for all connections.
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ChazmanC98
10-25-2023, 08:38 AM #5

The same performance metrics appear across different methods: file transfer via Windows Explorer, uploading through a locally hosted website, and using iperf on WSL Ubuntu. This suggests the problem isn't limited to a single tool. My doubt about it being a cable issue stems from expecting a noticeable drop in speed if the connection couldn’t handle full gigabit traffic in both directions, or if the disparity were even greater. The managed switch on one side is showing 1000Full for all connections.

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