Hi Alan,
I did indeed miss your email and I am sorry about that.
The other USB device is the card reader which is built-in
with the PC and I don't have anything plug to it. It would
be hard for me to remove it.
BTW, I have new finding last night. I searched through
the wireless driver forum of the device I am using and
found this post. It seems that this guy has the same
issue as I do. And he is not using the USB wireless device.
http://rt2x00.serialmonkey.com/phpBB2/viewtopic.php?t=914&highlight=channels
I need to do more investigation since one of my experiment
contradicts his finding. One of my experiment is the one
I described before with 4 computers with each channel
per computer. I don't see the drop in the speed when I
use 4 computer. Anyway, more research.
Thanks Alan, Oliver, and Greg for your response. I will let
you know if I discover anything.
Regards,
Adisorn.
Alan Stern wrote:
On Mon, 22 May 2006, aermongk wrote:
Hi USB guru,
Here is the update on my testing. I went out and bought 2 more USB
wireless devices
with different chipset. The original device is DLink DWL-G122 with
Ralink chip
and new device is DLink DWL-AG132 which has Atheros chip. This is to
make sure
that I am using different driver for each device. I then hooked both
DWL-G122 and
DWL-AG132 up to a PC and installed their driver and did the same to
another PC.
Run one channel at a time with ttcp, speed is good as expected. Again,
when I ran
both of them simultaneously, their speed drop again, same result as my first
experiment.
I couldn't explain why when I ran Wireless + Flash devices simultaneous,
the wireless
speed didn't drop (Hope I didn't do anything wrong here. Basically, I
just copied a
large file to Flash device (cp command followed by sync command) and at
the same
time run "ttcp"). But when I ran 2 different Wireless devices,
their speed dropped.
Any suggestion?
No. This merely suggests that the slowdown isn't caused by anything in
the USB stack.
BTW, Alan, do you have chance to look at the usbmon files I sent you? I
tried to post my
zip file to the forum but got rejected. I browse through them and
didn't spot anything.
I did look at them. Apparently you missed my response:
http://marc.theaimsgroup.com/?l=linux-usb-users&m=114796416906901&w=2
Alan Stern
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