Strange DMA error

Strange DMA error

[Todd Walter]

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I have a BCM4312 (using SSB) in a HP Mini 311 with an odd disconnect
issue.  If I use the link heavily (ie, streaming a movie) then all is
usually well.  If the link is idle it bombs with an error to stderr.
This happens with the hardware power control on or off.  Long transfers
do crash as well, just much less frequently.  For instance, a streamed
movie might go an hour and I can simply re-cycle wlan0 and recover.
However, if I am surfing it will die while I am reading one web page.
PIO mode is worse; typically it fails during the 4-way handshake
(timeout) and even when it works transfers will consume >70% of the CPU
and crash.  When a PIO mode drops I have to cold-boot to recover use of
the wireless card.  I have attached the PCI information for the card and
dmesg output as I am at a loss as how to procede.

Thanks for your time,

- - Todd.

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Strange DMA error

[Rafał Miłecki]

2011/4/18 Todd Walter <twalter@rogers.com>:
> I have a BCM4312 (using SSB) in a HP Mini 311 with an odd disconnect
> issue. ?If I use the link heavily (ie, streaming a movie) then all is
> usually well. ?If the link is idle it bombs with an error to stderr.
> This happens with the hardware power control on or off. ?Long transfers
> do crash as well, just much less frequently. ?For instance, a streamed
> movie might go an hour and I can simply re-cycle wlan0 and recover.
> However, if I am surfing it will die while I am reading one web page.
> PIO mode is worse; typically it fails during the 4-way handshake
> (timeout) and even when it works transfers will consume >70% of the CPU
> and crash. ?When a PIO mode drops I have to cold-boot to recover use of
> the wireless card. ?I have attached the PCI information for the card and
> dmesg output as I am at a loss as how to procede.

Can you just explain, what errors are you seeing? What is that bomb of
errors in your stderr? Can you see anything else than just:
wlan0: detected beacon loss from AP - sending probe request

-- 
Rafa?