Only getting 5 Gbps on 10 Gb LAN

Quartz

Quartz

Quartz

Soldato
Joined
1 Apr 2014
Posts
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Aberdeen
My 10 Gb ethernet switches (TL-ST1008) finally arrived so I've installed them and run a quick test between my Windows 11 i7-8700 box with an Intel X550 NIC in a x8 slot and my TrueNAS-SCALE-22.02.4 box with an Intel X540 dual-port NIC in an x16 slot. And I'm only getting half speed. 5 Gbps vs 10 Gbps. MTU is set to 1500 on the NAS. If I go via a 1 Gbps switch I get full speed.

I am, of course, missing something obvious. What is it?
 
Have you tried iPerf? As if you are using file copy then you are reliant on the speed of the source/destination disk speed etc.
 
Jumboframes enabled? MTU 9000+.

On the UniFi gear you must have Jumboframes enabled or you don’t get anywhere near. 10GbE.

MikroTik also requires a frame size of 1518 rather than 1500 for reasons I can’t remember, and Jumboframes to be anabled.
 
WJA96 said:
On the UniFi gear you must have Jumboframes enabled or you don’t get anywhere near. 10GbE.
Click to expand...

I don't have Jumbo Frames enabled on mine and I see 1GB/s+ in transfers from PC to NAS on UniFi USW-Pro-Aggregation / USW-Enterprise-8-PoE

This is a example I have posted before:

gztyXPD.png
 
Last edited:
WJA96 said:
Interesting. Are you all optical or is there a 10BaseT connection anywhere? I’m running several XG switches and they won’t hit the speeds unless jumboframes are enabled on the clients.
Click to expand...
NAS > USW-Pro-Aggregation (optical) > USW-Enterprise-8-PoE (optical) > PC (Onboard RJ45)

Ive tested in in a number of different combo's with no slow down, the only time I do see issues is when spanning tree gets upset (Ive set the USW-Pro-Aggregation as the root for now) or the SFP+ RJ45 connections flap.
 
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