still coping with zero packet loss over wireless

[John W. Linville]

On Tue, May 24, 2011 at 02:46:59PM +0000, Dave Taht wrote:
> yesterday I finally got a chance to move a few dozen meters out of the lab
> and test the latest build of uberwrt "capetown" and debloat-testing.
> 
> I'd hoped with the debloating techniques in place in capetown - reduced
> buffers (4), reduced sw retries (2), hw retries (2, or so I thought) I'd
> actually see some packet loss.
> 
> and what I saw instead, was pings that would take as long as 1.6 seconds to
> complete, and zero packet loss until I moved completely out of range of the
> router.
> 
> I never thought it would be so hard to lose a packet in my life!
> 
> Is there some system tunable, somewhere, in the linux wireless stack that
> I've missed, in getting packets to actually fail in 10s of ms?

Not one of which I am aware.  That sort of thing is going to depend
quite a bit on the hardware itself, and it's driver.  Maybe some
ath9k folk can comment?

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville at tuxdriver.com			might be all we have.  Be ready.