Comment 29 for bug 192765

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.