WLAN performance
 

Hi list!

Can anyone tell me how I could find the bottleneck on my wireless
network? According to iwconfig, both cards are cofigured for 54 MBit/s
but I only get about 13 MBit/s, both on NFS and scp.

Might it be the driver (iwl3945, rt61 from kernel 2.6.24)?
Unfortunately, iwspy doesn't work on these cards.

WLAN performance
 

ahh, marketing. Some people will believe anything!

Check the table at
http://www.oreillynet.com/pub/a/wireless/2003/08/08/wireless_throughput.html

or numerous other guides courtesy of google. This shows that maximum
throughput is roughly 27Mb/s for 54g, but in my experience its much less
in the real world.

Note that configuring a card for 54mb/s is the maximum - unless you are
quite close (distance wise), have little interference and dont have a
busy 802.11b on the same AP, you are not even going to see a 54, but a
fallback. And I think encryption will clip it even further if you are
using that (as you should be!)

BillK


On Fri, 2008-03-21 at 11:33 +0100, Florian Philipp wrote:
> Hi list!
>
> Can anyone tell me how I could find the bottleneck on my wireless
> network? According to iwconfig, both cards are cofigured for 54 MBit/s
> but I only get about 13 MBit/s, both on NFS and scp.
>
> Might it be the driver (iwl3945, rt61 from kernel 2.6.24)?
> Unfortunately, iwspy doesn't work on these cards.
--
William Kenworthy <billk@iinet.net.au>
Home in Perth!
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gentoo-user@lists.gentoo.org mailing list

WLAN performance
 

On 21 Mar 2008, at 10:33, Florian Philipp wrote:

... both cards are cofigured for 54 MBit/s
... I only get about 13 MBit/s, both on NFS and scp.


I'd be really quite happy with that.

As BillK remarks, 50% of your 54 Mbit is consumed by protocol
overhead. You're probably going to tell us that the two machines are
currently right next to each other, so losing an additional 50% to
interference & other intangibles might seem at first sight
unreasonable, but I doubt you'll ever do any better than that, and
you could waste a lot of time trying.


Wireless is for surfing on the sofa - you can easily get eighty times
this throughput with a cable, so investing time & energy in trying to
get a two-times performance increase is a poor return.


Stroller.
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