Transfer rate when moving larger files with MBP +AEBS over 802.11 n

Question

Hi Everyone
I´m very confused about the capabilites of the new AEBS dual band.
I have a Macbook Pro C2D 2,4ghz late 2007 running Snow Leopard , with an airport card N compatible.
Recently i add to my home network an AEBS dual band , and i configure it in bridge mode , with support to the N and G nets.
So when i try to copy a big file (around 2 GB) between the MBP and a FS mounted via NFS, sometime i have transfer rates about 9 to 12 MBytes / s , but after this al the copy´s that y do slow down to 3,4 MBytes / s.
Also i test this copy operation with a 2,5" USB connected directly to the AEBS, and the results are the same , the max rate transfer is 3,4 MBytes /s.
I tried with various radio modes , and different locations (Ireland, etc...) due to the limitation in Spain to use the 5ghz band.
If i look the properties of the connection with de alt button it shows me that the MBP is connected to the N network at 5Ghz and 300 Mbits /s , but the transfers only reach 3,4 Mbytes /s. When i have a G net the transfers reach 2,4 Mbytes / s , i think that i have an limitation in my airport card or a misconfiguration in the AEBS.
Sorry for my English.
Thanks in advance.
Nacho López.

Answer 1

Hi Paul,
The last test is....crazy.
The environment (my home) are the next:
AEBS dual band
MBP connected via wifi N (5ghz)
An old box with ubuntu server 8.10 (Pentium4) with a SATA drive
External USB 2,5" connected directly to the old box via usb.
I perform 2 test , a copy to the SATA drive of the old box, and another copy to the external USB mounted on the old box in the directory /opt/COMPARTIDO/usb.
Here are the results of a scp :
-----COPY TO THE MOUNTED USB-----------------
batman-3:Movies Nacho$ scp -r Ironman\ P1\ \[1080p\]\[AC3\].avi [email protected]:/opt/COMPARTIDO/usb
[email protected]'s password:
[email protected]'s password:
Ironman P1 [1080p][AC3].avi 100% 3334MB 19.6MB/s 02:50
-------19.6MB/S TO MOVE 3,3GB OF DATA IN 02:50--------------
-------COPY FROM MBP TO THE SATA DRIVE OF THE OLD BOX------------------
batman-3:Movies Nacho$ scp -r Ironman\ P1\ \[1080p\]\[AC3\].avi [email protected]:/opt/COMPARTIDO/Mldonkey/incoming/directories
[email protected]'s password:
Ironman P1 [1080p][AC3].avi 100% 3334MB 15.7MB/s 03:33
-------15.7MB/s------------------------------------------------------
So definitly mi issue is not related to wifi N or the performance of my disks. I suspect that maybe the AEBS don´t manage well the protocols like SAMBA (the external usb drive was poor perfomance shared via AEBS) or NFS (the directory shared from the old box also has the same poor perfomance).
If you can, try it, a simple unix scp can makes fly your files over your network.
I´ll continue posting what if discover about this.
Regards,
Nacho.