As niram reports to have done in his last post, I have compiled and installed 
latest http://wireless.kernel.org/ drivers, and all the same the bug is there.
I restate it: at completely random times, wireless totally stops working, and 
if issued ping accesspoint, a "sendmsg: no buffer space available" error 
message is returned.
However a preferential trigger seems to be torrent or openssh-based clients 
(ssh, sftp, sshfs). My setup:
slax 6.1.1
Linux slax 2.6.27.8 #1 SMP Sun Apr 12 22:55:24 Local time zone must be set--see 
zic  i686 VIA Esther processor 1000MHz CentaurHauls GNU/Linux

wifi usb dongle : alfa awus036h, rtl8187 chipset

I add that with old r8187 driver (such as the one included in
BackTrack3) there was no problem, but I can't get it to compile on
present 27.8 kernel.

I also tried to increase /proc/sys/net/core/wmem_max up to 100000000 as
read somewhere, without success.

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