16KB jumbo frames seem quite excessive to me. Are you sure that every single device on your network can support them (including any additional switch you might be using)?
Well, the router s/w only allows 1536 or up to 16000 in size?
Did find this,
http://forum.grasscity.com/silicon-v-alley/764486-definitive-guide-gigabit-jumbo-frames.html, and reading it I might not be able to even get them. My wife's system uses a Linksys 2500A USB (I think?) and it doesn't even HAVE a Jumbo Frame possibility as an Advanced setting. Not to mention a few other devices, like iPad's, TV, Wii, or even the printer. I also HAD IT OFF, but I did turn it on.
I tried going to my wife's system and it didn't work but the max. frame size I can set is 9KB which I did and that is working, see this:
====================================
C:\Users\Irv>ping 192.168.1.105 -f -l 6099
Pinging 192.168.1.105 with 6099 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 192.168.1.105:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
C:\Users\Irv>netsh int ip show interface
Idx Met MTU State Name
--- ---------- ---------- ------------ ---------------------------
12 10 9198 connected Local Area Connection
1 50 4294967295 connected Loopback Pseudo-Interface 1
----------------------------------
So that probably has nothing to do with my slower computer to router speed (no switches involved other than the part of the router).
I know it says ALL devices need to be Jumbo Frame, so I guess I should knock that option back to the 1536? The article above implies I'd not be able to connect to non-jumbo frame systems, but that isn't the case, after I set it to 9KB I can still get to shares on her computer, which doesn't have Jumbo Frames?
I wonder if my TCP/IP Global settings need be changed?
================
C:\Users\Irv>netsh int tcp show global
Querying active state...
TCP Global Parameters
----------------------------------------------
Receive-Side Scaling State : enabled
Chimney Offload State : disabled
NetDMA State : disabled
Direct Cache Access (DCA) : disabled
Receive Window Auto-Tuning Level : normal
Add-On Congestion Control Provider : none
ECN Capability : disabled
RFC 1323 Timestamps : disabled
Initial RTO : 3000
Receive Segment Coalescing State : disabled
=================
I think the above is a 'left-over' from when the system was Vista? Hmm, my wife's W8 system has the same settings, and I don't recall messing with those?