[Prism54-devel] Speed dropdowns every 10 seconds?

[Andriy Korud]

Hi,
I've made more tests and discovered that the problem is windows driver for prism54 (at least those from Planex). When using other cards as client the sustained rate (IP level) was 27-30Mbps and no holes. 
Short summary: AP - prism54/linux 2.6.9 driver, clients (all was Windows 2000):
- Planex GW-DS54G (prism-based) - 30Mbps with holes ebery 10 seconds;
- Linksys WPM54GV2 (Broadcom-based) - clear 28Mbps;
- D-Link DWL-G520+ (Texas-based) - clear 28Mbps;
- D-Link DWL-G520 (Atheros AR5213) - clear 30Mbps;

30Mbps on IP level give me 27Mbps on TCP level (according to netperf). 

Concerning beacon period - I'was trying this on the driver in 2.6.9 kernel with latest wireless tools.

best regards,

--

Andriy Korud 
application engineer 
email: a.korud at vector.com.pl 

VECTOR sp. z o.o. 
ul. Krzemowa 6 
81 - 577 Gdynia 
POLAND 
tel. +48 58 / 77 17 000 
fax +48 58 / 77 17 100 
<http://www.vector.com.pl/> 



-----Original Message-----
From: prism54-devel-bounces at prism54.org [mailto:prism54-devel-bounces at prism54.org]On Behalf Of Feyd
Sent: Friday, December 03, 2004 8:20 AM
To: prism54-devel at prism54.org
Subject: Re: [Prism54-devel] Speed dropdowns every 10 seconds?


On Thu, 02 Dec 2004 18:11:48 +0100
Andriy Korud <a.korud at vector.com.pl> wrote:

> I've analysed traffic between AP and client with kismet & Ethereal and
> what I see? Every 10 seconds (exactly) 
> client (station) sends  

This seems like a timer kicking in, may be powermanagement. Try to disable
it, or try with another firmware.

> 
> "Null function (no data)" packet and AP immediately answer with "IEEE
> 802 Acknowledgement". 
> 
> And on throughput graph this looks like "holes". 
> Any ideas?

Can you post a bit of the traffic? I'm no 802.11 expert but maybe we will
find why this happens. Mangle your MACs if you don't want to publish them.

> Also, it is possible to change beacon period?
> 
> "iwpriv xxx s_beacon" is silently ignored :-(

What version of the driver?

Feyd
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