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Old 27th March 2009, 01:06 AM
nucleaire Offline
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Join Date: Feb 2009
Posts: 3
file transfer rates (ad-hoc mode)

I am experiencing some weird download/upload rates on the ad-hoc wireless network using 4965AGN wireless card. From my FTP client (machine using 4965AGN card), when I upload some file to the FTP server (Windows machine using Linksys Dual Band A+G wireless adapter), I get ~100 KB/sec. While the download speed is around 500 KB/sec (why there is a difference of 5 times in file transfer rate?).

Do I need to change anything on my iwlagn wireless driver, such that the file upload speed be increased to 500 KB/sec (to match the download speed). Is it even related to the wireless driver or its something else?

One more thing, is there any way to enable higher rates on ad-hoc connection, I just see 1, 2, 5.5, 11 Mb/sec for the scanning results, while other AP in managed mode give up to 54Mb/s.


Details of the Linux FTP client machine:
[user@localhost iwlwifi]$ more /etc/fedora-release
Fedora release 10 (Cambridge)

[user@localhost iwlwifi]$ uname -a
Linux localhost.localdomain 2.6.27.7-134.am.dec31.fc10.i686 #2 SMP Sun Jan 4 20:03:46 MST 2009 i686 i686 i386 GNU/Linux

from: [user@localhost iwlwifi]$ dmesg
iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, 1.3.27kds
iwlagn: Copyright(c) 2003-2008 Intel Corporation
iwlagn 0000:10:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
iwlagn 0000:10:00.0: setting latency timer to 64
iwlagn: Detected Intel Wireless WiFi Link 4965AGN REV=0x4
iwlagn: Tunable channels: 11 802.11bg, 13 802.11a channels
iwlagn 0000:10:00.0: PCI INT A disabled
phy0: Selected rate control algorithm 'iwl-agn-rs'

[user@localhost ~]$ iwconfig wlan0
wlan0 IEEE 802.11abgn ESSID:"test"
Mode:Ad-Hoc Frequency:2.457 GHz Cell: 9E:A4:75:6D:3C:A0
Tx-Power=14 dBm
Retry min limit:7 RTS thr:off Fragment thr=2352 B
Power Management:off
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

[user@localhost ~]$ ifconfig wlan0
wlan0 Link encap:Ethernet HWaddr 00:13:E8:B9:8A:8F
inet addr:192.168.10.5 Bcast:192.168.10.255 Mask:255.255.255.0
inet6 addr: fe80::213:e8ff:feb9:8a8f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2419 errors:0 dropped:0 overruns:0 frame:0
TX packets:2331 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:465763 (454.8 KiB) TX bytes:2994205 (2.8 MiB)

and from [user@localhost ~]$ iwlist wlan0 scanning
Cell 04 - Address: 9E:A4:75:6D:3C:A0
ESSID:"test"
Mode:Ad-Hoc
Channel:10
Frequency:2.457 GHz (Channel 10)
Quality=100/100 Signal level:-30 dBm Noise level=-79 dBm
Encryption key:on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s
Extra:tsf=00000000c2ec019a
Extra: Last beacon: 6869ms ago
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