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Dec 02, 2011

ReadyNAS Ultra 4 Plus Jumbo Frame Issue

I am having trouble with jumbo frames with my ReadyNAS Ultra 4+. My setup is as follows. Both My Computer and ReadyNAS goes to the TRENDNET S80G. The TRENDNET S80G supports JF up to 9k MTU. So I had JF enabled on the ReadyNAS and my computer and I started a large transfer. However, I was seeing transfer rates of 15MB/s. If I disable JF on the ReadyNAS I get around 70MB/s. What's up with that? I verified that the ReadyNAS does have JF turned on. The MTU size is grayed out however it does read 9000. I also set my computer to 9K MTU size. I have my computer's nic also manually set 1000 FULL and the ReadyNAS shows 1000 Full as well. As a test I tried a direct connection from my computer to the ReadyNAS. And still the same issue. Not sure what to do from here on out. Any help would be appreciated.

I'd also like to mention that it doesn't matter if I leave JF on or off on my NIC. I get 70MB/s as long as JF is disabled on the ReadyNAS. But as soon as I turn on JF on the ReadyNAS. It doesn't matter if JF is on or off on my NIC, i get 15MB/s max. Also doesn't matter if I'm connected to the switch or direct connected. Also. If I transfer from the same PC to another PC on the network with JF enabled and set to 9K MTU. I see great speeds 85MB/s. So it has to be something on the ReadyNAS's side.

System Info:
Windows 7 Pro x64
ReadyNAS Ultra 4 Plus running RAIDiator 4.2.19
4 X 2TB HITACHI Deskstar 5K3000
TRENDNET S80G unmanaged Gig-E switch with 9k MTU JF Support
GA-Z68XP-UD3 Motherboard Onboard NIC (Realtek 8111E)

Performance

25 Replies

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Silversurfer79
Aspirant
Jan 17, 2012
Crap, no love the exact same thing!

All responses over 1500 all fail and under 1500 work perfectly. Ive also disabled JF and re-enabled it rebooted the switch. rebooted the Ultra and my pc all with the same outcome.

There must be a logical reason for this.

i just thought of something, JF are enabled on the Ultra and the Switch all the time, as soon as I enable JF on my PC the shares stop working which we know right, but why does it effect Frontview as well? :x

Thanks again for the help.
mdgm-ntgr
NETGEAR Employee Retired
Jan 17, 2012
Have you tried the direct-connect?
Silversurfer79
Aspirant
Jan 18, 2012
No I havnt, will take a look this evening. I dont see it making any diffrence, but Ill check.
StephenB
Guru - Experienced User
Jan 18, 2012
Silversurfer79 wrote:
All responses over 1500 all fail and under 1500 work perfectly.
Fail with a timeout or fail with the DF response?

In addition to direct connect, you might also try the ping -f -l xxxx test directly to the switch (taking advantage of its IP address).

Also, is there internet security/firewall software running on the PC?
Silversurfer79
Aspirant
Jan 20, 2012
I recieved my new Vergin Media "Super Hub" day before yesterday and it turns out my pc connects from my prosafe, then to the switch which is connected to the Ultra.
The MTU on the Prosafe (NETGEAR ProSafe Wireless-N VPN Firewall SRXN3205 Wireless router) is 1500 hence my delema. So im going plug the pc directly into the switch and see if this sorts out the problem. I could change the prosafe MTU, but I fear it may cause wifi issues. I did forget to add that to the list of hardware above as I didnt think it was routing that way.

Ill keep you guys post. thanks for all the help once again.