restrict Jumbo frames between 2 devices only?

[Teletha]

Hi

 

I only need jumbo frames to be set between the pc and the NAS but it also uses the same 10g ports to access the router/network will this create issues?  The pc, nas and the router is connected with a 10g managed switch.

Should i only enable jumbo frames if im directly connected to the nas and use a seperate network card to access my router/net that has the standard MTU set? 

Not too sure on how to set this up. 

[mariushm]

If both devices support jumbo frames, enable it and set both to same size (whatever is supported by both).

 

Maybe check what your network card or the nas network card supports... some network card "chipsets" / controllers can be picky about sizes even if you can configure that particular size...

[Teletha]

1 minute ago, mariushm said:

If both devices support jumbo frames, enable it and set both to same size (whatever is supported by both).

 

Maybe check what your network card or the nas network card supports... some network card "chipsets" / controllers can be picky about sizes even if you can configure that particular size...

jumbo frames works as it is now between the NAS and PC with a direct connection. But i have to introduce a 10g switch now which will make the direct connection to be moved to the switch where i also will be getting connection to my router via the same cable/network card. Will this be a issue ?

[Alex Atkin UK]

3 hours ago, Teletha said:

jumbo frames works as it is now between the NAS and PC with a direct connection. But i have to introduce a 10g switch now which will make the direct connection to be moved to the switch where i also will be getting connection to my router via the same cable/network card. Will this be a issue ?

The answer is maybe.  I stopped using jumbo frames as the benefit is minimal on a fast CPU and it can sometimes cause delays loading websites as they don't all negotiate MTUs as flawlessly as they should do.

 

In fact I even had to disable interrupt moderation on my NIC, another CPU usage reduction method that is more useful than jumbo frames, in order to get my speeds up to where they should be.

[Teletha]

On 10/2/2021 at 7:43 PM, Alex Atkin UK said:

The answer is maybe.  I stopped using jumbo frames as the benefit is minimal on a fast CPU and it can sometimes cause delays loading websites as they don't all negotiate MTUs as flawlessly as they should do.

 

In fact I even had to disable interrupt moderation on my NIC, another CPU usage reduction method that is more useful than jumbo frames, in order to get my speeds up to where they should be.

damn i didnt even think of testing without jumbo frames lol, i just tought u had to have it to get good speeds. tried to turn it of and go with standard 1500mtu and got good speeds

 

 

[Alex Atkin UK]

6 hours ago, Teletha said:

damn i didnt even think of testing without jumbo frames lol, i just tought u had to have it to get good speeds. tried to turn it of and go with standard 1500mtu and got good speeds

 

Yeah it was invented to save CPU cycles when they were precious, not so much with a high-end modern CPU.

 

Bearing in mind I'm running 10Gbit on my desktop (9900k), 10Gbit on my server (8600k) and 5Gbit on my gaming PC (5950X).