"Brian C. Grayson" <bgrayson@marvin.ece.utexas.edu> said:
>   I assume people without hardware FP wouldn't be able to use
> his software modem, as emulated FP is probably way too slow to
> satisfy the real-time demands.

Exactly.  Also, any additional context switch overhead would be
insignificant compared to the amount of CPU used by the modem code
itself.  The question is not how much overhead will be caused by
the use of floating point in the kernel, but whether supporting it
will cause overhead even when it is not used.
-- 
Andreas Gustafsson, gson@araneus.fi