what actually is the metric for poor performance? I can offer this:
computer1 is connected to my local net via fast ethernet. It has a file
of 500MB containing pseudo random numbers. I access this from computer2
via WLAN using:
scp 10.0.0.30:/home/test500mb /dev/null
and get these results for transfer rates:
Easy Peasy 1.1 (based on Ubuntu 8.04):____ 1.1 MB/s
Ubuntu Jaunty 9.04:_________________________ 2.6-2.9 MB/s
Ubuntu Karmic alpha: ______________________ 2.2-2.4 MB/s
Although the physical locations of the computers/router were almost the
same, I am not sure whether the difference between Jaunty and Karmic is
driver related or caused by something else, but the difference to 8.04
is striking.
computer2 is Acer Aspire One 110L, with the WLAN chip reported under
Karmic as:
lspci -v -nn -s 03:00
03:00.0 Ethernet controller [0200]: Atheros Communications Inc. AR5001 Wireless
Network Adapter [168c:001c] (rev 01)
Subsystem: Foxconn International, Inc. Device [105b:e008]
Flags: bus master, fast devsel, latency 0, IRQ 18
Memory at 35200000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [40] Power Management version 2
Capabilities: [50] Message Signalled Interrupts: Mask- 64bit- Queue=0/0
Enable-
Capabilities: [60] Express Legacy Endpoint, MSI 00
Capabilities: [90] MSI-X: Enable- Mask- TabSize=1
Capabilities: [100] Advanced Error Reporting <?>
Capabilities: [140] Virtual Channel <?>
Kernel driver in use: ath5k
Kernel modules: ath5k
--
Jaunty ath5k poor performance
https://bugs.launchpad.net/bugs/337311
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