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jason_f

Member

Registered: 2006-08-18

Posts: 78

"slow" speed with iwlagn [solved]

I'm not sure if I'm having a problem with my wifi card/driver, or router...or maybe this is 'normal'..

I can only get about 2MB/sec transfer rate copying files from my laptop, with:

02:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection (rev 61)

Browsing is fine, as my transfer is much greater than my broadband speed, but when copying files it seems way to slow for me.
I'm connected at G speed, so shouldnt I see somewhere closer to 54Mbit/sec?

Did a tests with iperf, here are the results.

------------------------------------------------------------
Client connecting to blackdesk, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.10.101 port 43287 connected with 192.168.10.100 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.3 sec  28.7 MBytes  23.4 Mbits/sec

I did find some people online that had slow speed issues with this driver, much slower than what i'm seeing, but tried those suggestions.
Disabling power management on the wlan card, loading the module with qos disabled, etc. Even set the router to only allow G connections.
Iwconfig shows 54Mbit/sec speed, yet I'm only seeing half of this.

Can anyone else validate this with the same wlan card?

FWIW, i have a dlink wbr-2310 router.

Last edited by jason_f (2009-06-14 19:26:59)

Stunts

Member

From: Portugal

Registered: 2009-03-28

Posts: 339

Website

Re: "slow" speed with iwlagn [solved]

Same issue here. Same card too.

Using a Pre-N Belkin router.

Any ideas?

jason_f

Member

Registered: 2006-08-18

Posts: 78

Re: "slow" speed with iwlagn [solved]

No ideas here..
I got a new trendnet router...
now with the iwl agn (and a newer kernel so who knows which is to blame), i'm now getting 16-19Mbits/sec.

Also have an s10 using the broadcom-wl driver..getting the same speeds with it...

anyone out there getting more than 25 meg on wireless? with any hardware?

ajb

Member

From: Poland

Registered: 2008-02-06

Posts: 31

Re: "slow" speed with iwlagn [solved]

You won't get any faster than aprox. 25Mbit/s. Everything is ok when you get about 20 Mbit/s. Main cause is that this is real data tranfser. The rest from 54Mb/s is used by control frames and others. You should also remember, that when you have several different Wlan on the same channel or channel diff is less than 5 you will get frames confilct and other technical problems in air... It's complicated

jason_f

Member

Registered: 2006-08-18

Posts: 78

Re: "slow" speed with iwlagn [solved]

>50% overhead? what an efficient protocol.
Thanks for this. I havent been able to find anything that lists the true throughput...all they say is 'you'll get less than 54.'

.:B:.

Forum Fellow

Registered: 2006-11-26

Posts: 5,819

Website

Re: "slow" speed with iwlagn [solved]

It's widely known that wireless, even in ideal circumstances, only gets you a rough 50% of the advertised throughput in real traffic. Ethernet for example has takes a hit too (you'll never squeeze 100 Mbps in traffic out of your LAN adapter), although not as huge, but still.

This is an interesting read on the subject. Don't forget overhead, however minimal, is always there. Data needs a framework to be handled in. No structure means chaos .

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