intermittent ath0
Erik Norgaard
norgaard at locolomo.org
Thu Dec 9 13:27:48 PST 2004
Tom Connolly wrote:
>>6.0-CURRENT as of yesterday, recompiled the kernel with options
>>
>>device ath
>>device ath_hal # Atheros HAL
>>device ath_rate_onoe # Onoe rate control for ath driver
> I use the ath0 driver also and I lose connection to the wireless router
> sometimes.
> I'm running FreeBSD 5.3 STABLE and using a D-Ling wireless card.
> I have the driver compiled into the kernel but I don't have the
> following:
>
> device ath_rate_onoe # Onoe rate control for ath driver
>
> Do I need this? What does it do?
First, I'm not sure if this has made it into -STABLE yet, looking into
the NOTES file on my 5.3p1 these options are not mentioned. I write
these because there seems to be two mutually exclusive options:
device ath_rate_onoe # Onoe rate control for ath driver
#device ath_rate_amrr # AMRR rate control for ath driver
mentioned in the NOTES file on 6.0. A look into the source, there is
actually a good explanation of what his does:
* A rate control module is responsible for choosing the transmit rate
* for each data frame. Management+control frames are always sent at
* a fixed rate.
(see the source for more, /usr/src/sys/dev/ath/if_athrate.h)
Getting the transmissionrates right may solve the buffering problem,
since if one end is sending too fast the other may run out of buffer. I
guess that the previous driver also had such code, but the new code is
better?
When I recompiled my kernel, I first did not include any of these and
the compilation failed. So, I guess it is needed in that case :-)
Now, I'm just guessing, and code appears quite new, so try to see if
things help or help debug :-)
Cheers, Erik
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