How do you increase the wmem_max value? I am getting permission denied when I 
do:
sudo echo 83886080 > /proc/sys/net/core/wmem_max 
bash: /proc/sys/net/core/wmem_max: Permission denied

I am also getting a constant dropping of network with my card (atheros
Ar928). Lot of these in dmesg:

[ 1395.576122] ath9k: DMA failed to stop in 10 ms AR_CR=0x00000024 
AR_DIAG_SW=0x40000020
[ 1396.593119] ath9k: DMA failed to stop in 10 ms AR_CR=0x00000024 
AR_DIAG_SW=0x40000020
[ 1396.812230] ath9k: DMA failed to stop in 10 ms AR_CR=0x00000024 
AR_DIAG_SW=0x40000020

(I do miss /var/log/messages which does not seem to contain much info).

My system:
Linux Bordeaux 2.6.31-12-generic #39-Ubuntu SMP Mon Oct 5 22:08:01 UTC 2009 
i686 GNU/Linu (Karmic with the latest updates installed).

I had similar problem with this card - dropping connection every 10
minutes, any big download is doomed to failure since the card freezes
and drops connections.

In the past, (prior to kernel 2.6.31), I simply used an older version of
compat-wireless (from April of 2009) which compiled fine and gave a rock
solid connection. Unfortunately, you can no longer compile that version
with the new kernel.

-- 
ping: sendmsg: No buffer space available (wifi)
https://bugs.launchpad.net/bugs/192765
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