[ath9k-devel] Poor performance on AR5418

[Luis R. Rodriguez <lrodriguez@atheros.com>]

On Tue, Aug 26, 2008 at 03:47:05PM -0700, Jeremy Apthorp wrote:
> 2008/8/27 Luis R. Rodriguez <mcgrof@gmail.com>:
> > On Tue, Aug 26, 2008 at 3:09 PM, Jeremy Apthorp <nornagon@gmail.com> wrote:
> >> I just built and tested out kernel 2.6.27-rc4 (with ath9k drivers
> >> included) on my MacBook Pro 3,1. There's good news and there's bad
> >> news.
> >>
> >> The good news is that the AR5418 is discovered and added as a device,
> >> and it works! It associates and I can ping places.
> >>
> >> The bad news is that it's really, really slow. iwconfig reported a
> >> network speed of 1Mbps, vs. the 24Mbps+ that I get from madwifi (this
> >> is a g network). Link quality seems normal; it hangs around 15-30/100
> >> compared to around 20/70 under madwifi. However, I get 65%+ packet
> >> loss just pinging my router from ath9k, and zero from madwifi.
> >>
> >> Is anyone else having this problem? Is there anything I can do to help
> >> it get fixed? Unfortunately I don't have any experience with wifi
> >> drivers, so I'd not be much use for code... but I can run tests and
> >> collect debug info if necessary.
> >
> > Link quality is not 100% correct, its actually better. We need to add
> > noise floor calibration to get it to report more accurate values. So
> > for now just use it as a guide. Also the rate reported by iwconfig is
> > not correct, please rely on iperf for proper performance tests.
> 
> I was more concerned about the packet loss than the link quality or
> the reported rate. Also, I tried loading google.com in a browser, and
> it took several minutes.

How soon after associating and getting an IP and pinging do you get
packet loss? Whatever it is we definitely will need to fix it.

  Luis