Re: poor performance with ath5k; reverting to ath_pci

["John W. Linville" <linville@tuxdriver.com>]

On Tue, Jan 20, 2009 at 10:38:08PM -0500, Glenn Burkhardt wrote:
> On Friday 16 January 2009 10:33:13 Bob Copeland wrote:
> > On Thu, Jan 15, 2009 at 5:34 PM, Glenn Burkhardt
> >
> > <gbburkhardt@verizon.net> wrote:
> > > ath5k_pci 0000:00:07.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
> > > ath5k_pci 0000:00:07.0: registered as 'phy0'
> > > phy0: Selected rate control algorithm 'pid'
> >
> > Can you change the rate control algorithm to minstrel and retry?
> 
> I built a 2.6.28.1-9 kernel to get the minstrel code for ath5k.  The 
> kernel for Suse 11.1 is 2.6.27.7-9.  But that means that more could have 
> changed besides the rate control code.
> 
> It looks like minstrel and pid give about the same result, a bit worse that 
> the ath_pci driver right now.  Performance seems to vary from day to day.  
> I'll experiment some more, and switch transmission channels.  I'm not getting 
> the really poor performance with ath5k right now.
> 
> I haven't looked yet - is there a way to switch to 'pid' rate control without 
> rebuilding the kernel?

If you configure your kernel to include multiple rate control
algorithms then you can use the 'ieee80211_default_rc_algo' module
option for mac80211.  Of course, changing that only works if you
rmmod/insmod mac80211.

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