Question 2.5BASE-T NAS Downloads Slower than Gigabit

therrake

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I recently installed TRENDnet 2.5BASE-T PCIe network adapters (TEG-25GECTX) in my home server (setup as a NAS) and main rig. Systems are setup to access the internet using their built-in Gigabit ports. The 2.5BASE-T cards are directly connected to each other with a Cat6A cable. They live on their own subnet to (theoretically) enable faster file transfer speeds. The server is running a Samba share linked to a RAID 1 array. (system specs below)

Iperf and NAS Performance Tester benchmarks confirm that the 2.5BASE-T card should be faster than the gigabit connection (not a surprise). (screen caps below)

When I upload files to the server from my PC, actual 2.5BASE-T speeds exceed those of the Gigabit link. (screen caps below)

However, when I download files from the server to my PC, actual Gigabit link speeds exceed those of the 2.5BASE-T card--by nearly twofold. This has proven consistent across various tests. (screen caps below)

Why is gigabit outperforming 2.5BASE-T in download speed? How can this be fixed?

Server:
Dell T110 II running Ubuntu 20.04
Samba install sharing a RAID 1 array
TRENDnet 2.5BASE-T PCIe network adapter
2x 4TB SAS 6.0GBPS 7200 RPM

Main rig:
Ryzen 5 1600AF on Windows 10
TRENDnet 2.5BASE-T PCIe network adapter
WD Blue NVMe M.2 2280 500GB

Upload 2.5Base-T Link:


Upload Gigabit link:



Download 2.5BASE-T Link:


Download Gigabit Link:




Iperf 2.5BASE-T Link Test:


Iperf Gigabit Link Test:


NAS Performance Tester 2.5BASE-T Link Test:


NAS Performance Tester Gigabit Link Test:
 
Very strange indeed. You've done everything I would have and have gotten puzzling results. I would guess this is somewhere in the driver for the 2.5g nic, but it's odd that it only affects the file transfer test and not other tests. What version of smb are you running on each link and each end (client and server)?
 

therrake

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Very strange indeed. You've done everything I would have and have gotten puzzling results. I would guess this is somewhere in the driver for the 2.5g nic, but it's odd that it only affects the file transfer test and not other tests. What version of smb are you running on each link and each end (client and server)?
I greatly appreciate the reply and sanity check! Ubuntu is running Samba 4.11.6 (from Samba Status). The Windows box is running Samba 1.0 (from Windows control panel). I plan to investigate possible driver solves tonight. Will update the thread if that fixes the issue.

Thank you.
 
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kanewolf

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Moderator
The 2.5 Gb network with a 2.x.y.z subnet could be a problem. That is a routable IP address. I would use a 10.x.y.z if your internet is on 192.168.x.y also ensure you don't have a default gateway on the 2.5Gb ports.
 
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therrake

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The 2.5 Gb network with a 2.x.y.z subnet could be a problem. That is a routable IP address. I would use a 10.x.y.z if your internet is on 192.168.x.y also ensure you don't have a default gateway on the 2.5Gb ports.
Confirmed there are no default gateways set. Unfortunately, the 10.x.y.x solution did not address the download speed issue.
 
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