Jumbo Frames

[Onichan]

I enabled jumbo frames to 6000 and tried 5000 on my NAS and the webgui became unresponsive half the time. It seems like it is dropping packets for some reason. I have been using 7000 and 6000 jumbo frames for quite a while now to my old NAS so I know it is the new NAS itself that is the problem. Has anybody else gotten jumbo frames to work with their NAS? I am using an Asrock Z77 Pro4-M.

[raulfg3]

What NIC use your board?

I sucessfully use jumbo frames using Intel NICs but failed using realtek NIC.

[Onichan]

It's Realtek...
RTL8111E

[raulfg3]

Ok, i notice unresponsive webgui like You , when try jumbo Frames to 6000 that is the max. For realtek BSD driver, by other hand i don't notice espectacular increase of banwith, perhaps a 5% or so on, i only notice a flat throughput, wihtout spikes, but because the comented problem (unresponsive webgui) i actually use MTU=1500 that works very well for me, ( 80 to 90 MBps), and 100 to 110 when transfer using FTP, so I'm happy.

[Onichan]

Bummer, oh well if I actually do get around 90 then that's not too bad, thanks.

[Onichan]

So after trying various settings I have found out that the higher jumbo frame you use the less data you can transfer before the NIC craps out. Realtek NIC's aren't good on FreeBSD as even with jumbo frames disabled the NIC would drop after ~600-800GB transferred. So I have bought a Intel Gb NIC to use.

For anybody else that has a Realtek I would recommend to just spend the $30 and buy something else.

[raulfg3]

I agree.

[SKL111]

You can get a cheaper broadcom dualport for about 30 off ebay, if you have the switch that supports LACP.

[raulfg3]

several user post about Working Jumbo Frames on new Nas4Free 9.1.0.1.XXX releases based on BSD 9.1 please try it before to buy a new NIC.