[ath9k-devel] Poor performance on AR5418

From: Amit Sood <as22_2000@yahoo.com>
To: ath9k-devel@lists.ath9k.org
Subject: [ath9k-devel] Poor performance on AR5418
Date: Wed, 27 Aug 2008 04:19:27 +0530 (IST)	[thread overview]
Message-ID: <191132.48403.qm@web95011.mail.in2.yahoo.com> (raw)

Hi Luis,

Beside the reporting from iwconfig, we are also having packet drops. I'm not sure how to resolve that. I guess OS controls the traffic on interface on the speed reported under iwconfig. That is my exp so far with wifi cards. Even if signal strength is 70-80 & speed is 1Mb, the communication really becomes choppy.

cheers,

-amit-

----- Original Message ----
From: Luis R. Rodriguez <mcgrof@gmail.com>
To: Jeremy Apthorp <nornagon@gmail.com>
Cc: ath9k-devel at lists.ath9k.org
Sent: Wednesday, 27 August, 2008 8:23:31 AM
Subject: Re: [ath9k-devel] Poor performance on AR5418

On Tue, Aug 26, 2008 at 3:09 PM, Jeremy Apthorp <nornagon@gmail.com> wrote:
> I just built and tested out kernel 2.6.27-rc4 (with ath9k drivers
> included) on my MacBook Pro 3,1. There's good news and there's bad
> news.
>
> The good news is that the AR5418 is discovered and added as a device,
> and it works! It associates and I can ping places.
>
> The bad news is that it's really, really slow. iwconfig reported a
> network speed of 1Mbps, vs. the 24Mbps+ that I get from madwifi (this
> is a g network). Link quality seems normal; it hangs around 15-30/100
> compared to around 20/70 under madwifi. However, I get 65%+ packet
> loss just pinging my router from ath9k, and zero from madwifi.
>
> Is anyone else having this problem? Is there anything I can do to help
> it get fixed? Unfortunately I don't have any experience with wifi
> drivers, so I'd not be much use for code... but I can run tests and
> collect debug info if necessary.

Link quality is not 100% correct, its actually better. We need to add
noise floor calibration to get it to report more accurate values. So
for now just use it as a guide. Also the rate reported by iwconfig is
not correct, please rely on iperf for proper performance tests.

  Luis
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