Kbase P98009: Wireless LAN clients not performing as good as non-wireless LAN clients
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
14/06/2006 |
|
Status: Verified
SYMPTOM(s):
Client performance problems on wireless LAN
Client performance on non-wireless LAN is acceptable
Client and Database server machines are on the same subnet
pathping from client to server on non-wireless LAN takes 30 milliseconds to reach database server.
pathping from client to server on wireless LAN takes 47 milliseconds to reach database server.
pathping command used to validate that performance problem exists on a networking layer and not Progress related.
Application is local to the client.
Client's temporary files are on local disks.
CAUSE:
Not known at the time of this writing.
FIX:
Recommendation is to work with your network administrator to identify if there are differences in configuration and
communication protocols being used by wireless and non-wireless clients.
Wireless connections make use of the IEEE 802.11, the Wi-Fi standard. The following is a general list of the IEEE 802.11 standards.
For additional information on the IEEE 802.11, the Wi-Fi standards see http://en.wikipedia.org/wiki/802.11b.
Wireless connections:
802.11b: 11 Mbps, 2.4 GHz Unregulated frequency Pros of 802.11b - lowest cost; signal range is best and is not easily obstructed.
Cons of 802.11b - slowest maximum speed; supports fewer simultaneous users; appliances may interfere on the unregulated frequency band and hence speed.
802.11a: 54 Mbps, 5 GHz Regulated frequency Pros of 802.11a - fastest maximum speed; supports more simultaneous users; regulated frequencies prevent signal interference from other devices.
Cons of 802.11a - highest cost; shorter range signal that is more easily obstructed.
802.11g: 54 Mbps, 2.4 GHz Unregulated frequency Pros of 802.11g - fastest maximum speed; supports more simultaneous users; signal range is best and is not easily obstructed. Backwards compatible with 802.11b Cons of 802.11g - costs more than 802.11b; appliances may interfere on the unregulated signal frequency and hence speed.
Cable (wired) connections:
Ethernet:
When first widely deployed in the 1980s, Ethernet supported a maximum theoretical data rate of 10 megabits per second (Mbps). Later, Fast Ethernet standards increased this maximum data rate to 100 Mbps. Today (2006), Gigabit Ethernet technology further extends peak performance up to 1000 Mbps.