There are a variety of possible reasons:
•If you are transferring many smaller files, you will see a performance decrease. Over a wireless connection, it takes more time to begin and end a file than it does over a wired connection. You should not notice a performance decrease in the middle of transferring a large file.
Suggestions: There is little you can do about this. If you will frequently be transferring smaller files, then you can improve performance by archiving them into a single file before the transfer, and unarchiving them at the destination after the transfer.
•If you are transferring files between Windows computers using Explorer or Internet Explorer, your file transfer may be impacted by Windows downloading Extended Attributes. These include dozens of different pieces of information, including icons, thumbnails, picture size and date, music encoding rate, ID3 tags, and etcetera.
Suggestions: Transfer from or into a rather empty folder on the distant machine. Close other folders from that machine. Extended attributes are only collected for open folders. Similarly, with no folders of the distant computer open, use the command-line programs COPY or XCOPY. These programs do not transfer any of the attributes from the distant computer.
•If the wireless distant machine is situated such that it can clearly communicate with the Access Point (AP), but is out of reception range of the other wireless computer, then performance will be impacted. This is because the two wireless clients cannot tell when the other is transmitting. As a result, they attempt to transmit at the same time, disrupting reception at the AP and requiring that the last packet(s) be sent again.
Suggestions: The best solution is to improve the antenna(s) on one (or both) clients so that they can hear each other. This will cause them to wait for the other to finish a transmission and reduce simultaneous transmissions. Otherwise, turn on and/or lower the setting on the AP known as Clear to Send / Ready to Send (or RTS/CTS ... it goes by different labels, and is often found on the advanced configuration pages). If your router does not have this setting, check your clients. This puts the network into a mode where the Access Point becomes a traffic cop, telling each computer when it is time to send. Adjust this setting for the best performance. Using this setting when there are no hidden nodes will lower performance, but it will increase performance when there are hidden nodes.
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by funchords  edited by No_Strings
last modified: 2006-01-10 16:27:57 |
