Performance degradation with WEP enabled

[Jihong Kim]

Hi,
 
I'm using hostap-2002-10-12.tar.gz
<http://hostap.epitest.fi/releases/hostap-2002-10-12.tar.gz> .
 
I tested the throughput with the host AP (on Redhat Linux 7.2).
 
With open system (no encryption), I got about 4.7 Mbps (GUI,
daemons/processes are turned off).  When they were on, the throughput
was about 4 Mbps.
 
With WEP (encryption) enabled, the highest I got was about 2.7 Mbps,
when GUI and other daemons/processes were turned off.  (With GUI and
other daemons/processes running in the background, the throughput was
about 600 Kbps.)
 
I believe this is due to the fact that WEP encryption implemented in the
device driver is used instead of the WEP encryption in PRISM MAC chip.
 
Is there a way to improve the throughput of WLAN with WEP enabled?    Do
you think using a more powerful processor (CPU) will reduce the
performance gap between open system and WEP?
 
Thanks in advance.
 
- Jihong
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