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Slow WLAN file transfer (Asus RT-N66U)

post #1 of 2
Thread Starter 
My file server is running Ubuntu 12.04 and I'm sharing files from it over samba. It is connected via gigabit ethernet.
My desktop, running Windows 8.1, is also connected via gigabit ethernet.
I can transfer files between the two and completely saturate that gigabit pipe.

However, I just got a Surface Pro 2, and I'm trying to stream HD movies from my server to the device over WiFi.
For some reason, I can't break much past 1.5MB/s transferring files over the network. I've tried streaming through XBMC and a standard file copy; no difference.

To add the confusion, if I connect to my guest network and then use my VPN server (installed on the router) to access the file server, I get around 3.2MB/s.

I've been running diagnostics to determine the root and I think I've found it but I have no idea what is causing it or how to fix it.

Router: Asus RT-N66U
Surface Pro 2 Network Card: Marvell Avastar 350N (Driver 19/09/2013 v14.69.24044.150)


InSSIDer:
Link Score: 100
Co-Channels: 0
Overlapping: 0
5GHz Network
Channel: 48+44

iperf
File Server as Server; Surface Pro 2 as Client - TCP
Code:
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 192.168.0.90 port 5001 connected with 192.168.0.56 port 57367
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0- 1.0 sec  10.1 MBytes  84.7 Mbits/sec
[  4]  1.0- 2.0 sec  10.4 MBytes  87.6 Mbits/sec
[  4]  2.0- 3.0 sec  10.6 MBytes  88.8 Mbits/sec
[  4]  3.0- 4.0 sec  10.7 MBytes  89.5 Mbits/sec
[  4]  4.0- 5.0 sec  10.1 MBytes  84.4 Mbits/sec
[  4]  5.0- 6.0 sec  10.2 MBytes  85.8 Mbits/sec
[  4]  6.0- 7.0 sec  7.04 MBytes  59.1 Mbits/sec
[  4]  7.0- 8.0 sec  10.8 MBytes  90.2 Mbits/sec
[  4]  8.0- 9.0 sec  10.6 MBytes  89.1 Mbits/sec
[  4]  9.0-10.0 sec  8.62 MBytes  72.3 Mbits/sec
[  4]  0.0-10.0 sec  99.2 MBytes  83.1 Mbits/sec

Surface Pro 2 as Server, File Server as Client
Code:
------------------------------------------------------------
Client connecting to 192.168.0.56, TCP port 5001
TCP window size: 22.9 KByte (default)
------------------------------------------------------------
[  3] local 192.168.0.90 port 40233 connected with 192.168.0.56 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec  1.50 MBytes  12.6 Mbits/sec
[  3]  1.0- 2.0 sec  1.50 MBytes  12.6 Mbits/sec
[  3]  2.0- 3.0 sec  1.50 MBytes  12.6 Mbits/sec
[  3]  3.0- 4.0 sec  1.25 MBytes  10.5 Mbits/sec
[  3]  4.0- 5.0 sec  1.62 MBytes  13.6 Mbits/sec
[  3]  5.0- 6.0 sec  1.50 MBytes  12.6 Mbits/sec
[  3]  6.0- 7.0 sec  1.38 MBytes  11.5 Mbits/sec
[  3]  7.0- 8.0 sec  1.50 MBytes  12.6 Mbits/sec
[  3]  8.0- 9.0 sec  1.50 MBytes  12.6 Mbits/sec
[  3]  9.0-10.0 sec  1.62 MBytes  13.6 Mbits/sec
[  3]  0.0-10.1 sec  15.0 MBytes  12.4 Mbits/sec


For some reason, it gets capped and I haven't got a clue why.

Any suggestions?
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(8 items)
 
   
CPUMotherboardGraphicsRAM
Intel Core i5-3570K Asus Maximus V Gene Asus Radeon HD 7970 3GB Mushkin Blackline 16GB 
Hard DriveHard DriveCaseOther
2x Samsung 830 256GB Seagate Barracuda 3TB Silverstone Temjin TJ08-E BeQuiet E9-700w 
CPUMotherboardRAMHard Drive
Intel i3-3225 ASUS P8B75-MLX Corsair Ballistix Tactical Western Digital Red 
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post #2 of 2
Thread Starter 
I switched my router back to the Virgin Media Superhub for testing, and got 4-8MB/s each way on a 2.4GHz network, so the problem lies with the Asus RTN66U router. I'm going through the control panel but nothing jumps out at me.


Edit: Figured it out.
Enabling Broadcast Support in the VPN config absolutely decimates the the file transfer speed. Disabled it and I'm pulling the files across at 14MB/s.
Quote:
The Broadcast Support setting in 2-(3) allows broadcast packet transfers between VPN clients and local clients.
For example, the PC needs to send the broadcast packets to all LAN PCs to know which PC enables the Network Place Service.
The VPN client cannot send broadcast packets to the LAN while the Broadcast Support setting is disabled.
When Broadcast Support is disabled, VPN clients cannot detect the PC running Windows Network Place and will not be able to locate other PCs in the network. To connect to PCs in the LAN, VPN clients will manually have to type the IP address to connect to a PC in the LAN.

Since my server has a static IP, I don't need broadcast support, so I can happily turn it off.
Edited by [Adz] - 10/26/13 at 2:39am
Echo
(8 items)
 
   
CPUMotherboardGraphicsRAM
Intel Core i5-3570K Asus Maximus V Gene Asus Radeon HD 7970 3GB Mushkin Blackline 16GB 
Hard DriveHard DriveCaseOther
2x Samsung 830 256GB Seagate Barracuda 3TB Silverstone Temjin TJ08-E BeQuiet E9-700w 
CPUMotherboardRAMHard Drive
Intel i3-3225 ASUS P8B75-MLX Corsair Ballistix Tactical Western Digital Red 
OSPowerCaseOther
Ubuntu Corsair CX500M Norco RPC-4224 LSI SAS 9207-4i4e HBA 
Other
Chenbro CK22804 24-Port SAS Expander Card 
  hide details  
Reply
Echo
(8 items)
 
   
CPUMotherboardGraphicsRAM
Intel Core i5-3570K Asus Maximus V Gene Asus Radeon HD 7970 3GB Mushkin Blackline 16GB 
Hard DriveHard DriveCaseOther
2x Samsung 830 256GB Seagate Barracuda 3TB Silverstone Temjin TJ08-E BeQuiet E9-700w 
CPUMotherboardRAMHard Drive
Intel i3-3225 ASUS P8B75-MLX Corsair Ballistix Tactical Western Digital Red 
OSPowerCaseOther
Ubuntu Corsair CX500M Norco RPC-4224 LSI SAS 9207-4i4e HBA 
Other
Chenbro CK22804 24-Port SAS Expander Card 
  hide details  
Reply
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