Re: kernel: ath0: device timeout

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From
Sam Leffler <sam@errno.com>
Date
28 Apr 2006 21:04:27
Subject
Re: kernel: ath0: device timeout
Message-ID
44528359.1030304@errno.com

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AT Matik wrote:
> On Friday 28 April 2006 17:48, Ross Finlayson wrote:
>> I've been seeing quite a few of these (on FreeBSD 6.0-STABLE, as of a
>> couple of weeks ago). This is with a Compex WLM54AG miniPCI card.
>>
>> Is this a known issue, and is a fix in the works?
>>
>
> in my case it stopped when I compiled ath_rate_onoe instead of rate_sample as
> well as I got much higher throughput and response times

If changing the tx rate control algorithm really fixes it then that says
sample may be handing back bogus rate codes. Since I can't make this
happen someone else needs to dig.

As to better performance, onoe is not especially good and I do not
recommend it. However sample is too aggressive on up-shifting the tx
rate and tends to vary the rate too quickly so can degrade performance
when signal deteriorates. I have done extensive testing of all the rate
control algorithms as well as a proprietary one and chose sample as the
default. However none are anywhere near as effective as the proprietary
one.

Sam


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