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Slow 10GB data transfers

Slow 10GB data transfers

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naruto162
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05-30-2016, 12:49 AM
#1
Hello everyone, welcome! I know this might be in the wrong spot, but I’m here to share my experience. I’m dealing with a Windows 10 PC and an unRAID server running version 6.8.2. After checking many guides and searching online, I think I’ve configured everything correctly, yet my speed only reaches around 400+ MB/s, capped at 500. A RAM disk on the Windows machine didn’t help, and using iperf didn’t improve things much either. The hardware I’m using is a Mellanox model with an Intel Xeon processor, and I have a large amount of storage set up. I followed the Linux setup instructions carefully, adjusting settings like MTU and interfaces. My system includes SSDs, a 64GB RAM module, and a dual-core server with 12800R RAM. The performance still doesn’t meet expectations despite all the tweaks.
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naruto162
05-30-2016, 12:49 AM #1

Hello everyone, welcome! I know this might be in the wrong spot, but I’m here to share my experience. I’m dealing with a Windows 10 PC and an unRAID server running version 6.8.2. After checking many guides and searching online, I think I’ve configured everything correctly, yet my speed only reaches around 400+ MB/s, capped at 500. A RAM disk on the Windows machine didn’t help, and using iperf didn’t improve things much either. The hardware I’m using is a Mellanox model with an Intel Xeon processor, and I have a large amount of storage set up. I followed the Linux setup instructions carefully, adjusting settings like MTU and interfaces. My system includes SSDs, a 64GB RAM module, and a dual-core server with 12800R RAM. The performance still doesn’t meet expectations despite all the tweaks.

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KrimaseKK
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05-31-2016, 09:09 AM
#2
Did you verify the CPU usage on both the client and server during testing? It’s possible you’re encountering a limitation that’s restricting the iperf3 outcome.
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KrimaseKK
05-31-2016, 09:09 AM #2

Did you verify the CPU usage on both the client and server during testing? It’s possible you’re encountering a limitation that’s restricting the iperf3 outcome.

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Luiisss
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05-31-2016, 09:14 AM
#3
Thanks for the reply. I didn't consider that since I'm not familiar with these tools and thought the CPU wasn't a big factor. I plan to run tests with iperf and see. But I'm assuming the server might still have a bottleneck despite having 40 cores.
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Luiisss
05-31-2016, 09:14 AM #3

Thanks for the reply. I didn't consider that since I'm not familiar with these tools and thought the CPU wasn't a big factor. I plan to run tests with iperf and see. But I'm assuming the server might still have a bottleneck despite having 40 cores.

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SteveHarveyJr
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05-31-2016, 09:42 AM
#4
During the iperf test, the CPU usage on both client and server stays under 30 percent while moving a file between the two RAM disks. I see around 48% instead.
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SteveHarveyJr
05-31-2016, 09:42 AM #4

During the iperf test, the CPU usage on both client and server stays under 30 percent while moving a file between the two RAM disks. I see around 48% instead.

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