[Click] 802.11 tunning

[John Bicket]

Hi David,
Those are just constants defined in the ieee 802.11 specs and changing
them won't  do what you want; they are mainly used for calculating the
duration of packets, but otherwise have no affect on the actual values
used by wireless hardware.  Some cards allow you to change the mac
level parameters; I know the madwifi driver has some mechanisms for
changing difs and sifs to make long distance links function.

John


On 4/25/06, David Fuste <dfuste at ac.upc.edu> wrote:
> Hi all,
> Currently, I am doing research in the area of wireless ad-hoc networks
> and more exactly, in some improvements to achieve better operation and
> functioning of these networks.
> One of my needs is to be able to "tune" the values of DIFS, SIFS, NAV...
> parameters of the 802.11 standard. In Click Modular Router, I've found
> these parameters in "clicknet/wifi.h".
> So, I just want to know if these parameters (constants in wifi.h) are
> beared in mind by the kernel (or wireless iface) when click starts to
> run, or simply are values never used by the kernel of linux (so, they
> are only nomenclature in wifi.h).
> I mean, if I change the value of the SIFS for example, will it cause
> changes in the time that the wireless interface wait for sending ACKs or
> not? So, does Click can really change the value of the Short Inter Frame
> Space of the wireless interface?
>
> Thanks a lot!
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