Andrew Cagney <cagney@mac.com> writes:

> Just an update on this.  Went back to a 1.6 stable kernel (which
> hopefully doesn't have smp) and am still seeing a problem.  The thing
> that is striking is the collision rate:

So, I've been reading this thread with some curiosity, because I've
been using my wi0 interface on an iBook all along, tracking -current,
and haven't seen this problem. I'm using a D-Link DWL1000 access point.

Looking at the output of "netstat -I wi0", I do see a high collision
rate when a lot of traffic is moving:

  wi0 in        wi0 out              total in      total out            
 packets  errs  packets  errs colls   packets  errs  packets  errs colls
     151     0      222     0  3840       151     0      222     0  3840
     819     0     1216     0 19968       819     0     1216     0 19968
     162     0      217     0  3584       162     0      217     0  3584
     108     0      132     0  1792       108     0      132     0  1792
      46     0       46     0     0        46     0       46     0     0
      17     0       17     0  1024        17     0       17     0  1024

... in fact, an order of magnitude more collisions than actual packet
transmissions. Do we trust those statistics? It seems like performance
would be a lot worse if that were the real error rate. 

These numbers were taking while scp'ing a 13M file to a machine on the
wired side of the network; the speed came out to be 5 Mbps. 

        - Nathan