Re: [Madwifi-devel] Slottime calculation correct?

[Jiri F. <jir...@hl...>]

starman986  wrote / napísal(a):
> Some changes went in a while back that affected the slottime value when setting long distance links.  Has anyone verified these changes?  
>   
i have done field testing and all is correct
> The basic question I have is why slottime is multiplied by 2!
i have not found any refernce in the code where the slottime value is 
used multiplied by 2. The changes that was done has improved 11b ap 
operations where i mistakely used athctrl to set the distance. It fixed 
rts/cts problems i had with athctrl calculated values ...
>   Slottime is not a packet that can be affected by distance but is a spacing gap that all clients of a BSS agree upon to derive other delay timings.  So the way it is now, slottime is some huge number.
the number is calculated from a,b,g mode and is extended only by 
(distance * 2) / 299 whis is +- correct as before
>   Either the previous version never worked well or this new value is going to have some problems.  
>   
previous settings should work correct only for a and partialy for pure g 
modes
> The acktimeout and ctstimeout values are approximately the same as before.  These values are affected by distance and have always been twice the distance of the clients from the AP.
>   
calculation for a mode was always correct. i used it to measure distance 
betwen ptp nodes. It showed correct distance when i compared it with 
googlemaps (longest link i got was 17Km). To measure distance betwen 
nodes increase distance with athctrl and check dropped packets via 
ifconfig or athstats. corect distance is when packets stop dropping + 
300 (sometimes is beter use +600 because some devices do not like 
extremly low or high temperatures)
> Can someone shed some additional light on why this was changed and how it was tested?
>   
i have not found any problems and improved quality in the 11b mode. all 
the changes are correct. If i missed something please explain it.

Jiri
> Thanks,
>
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