* [gentoo-user] WLAN performance
@ 2008-03-21 10:33 Florian Philipp
2008-03-21 10:55 ` William Kenworthy
2008-03-21 14:36 ` Stroller
0 siblings, 2 replies; 3+ messages in thread
From: Florian Philipp @ 2008-03-21 10:33 UTC (permalink / raw
To: Gentoo-User
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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.
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [gentoo-user] WLAN performance
2008-03-21 10:33 [gentoo-user] WLAN performance Florian Philipp
@ 2008-03-21 10:55 ` William Kenworthy
2008-03-21 14:36 ` Stroller
1 sibling, 0 replies; 3+ messages in thread
From: William Kenworthy @ 2008-03-21 10:55 UTC (permalink / raw
To: gentoo-user
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [gentoo-user] WLAN performance
2008-03-21 10:33 [gentoo-user] WLAN performance Florian Philipp
2008-03-21 10:55 ` William Kenworthy
@ 2008-03-21 14:36 ` Stroller
1 sibling, 0 replies; 3+ messages in thread
From: Stroller @ 2008-03-21 14:36 UTC (permalink / raw
To: gentoo-user
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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gentoo-user@lists.gentoo.org mailing list
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2008-03-21 10:33 [gentoo-user] WLAN performance Florian Philipp
2008-03-21 10:55 ` William Kenworthy
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