[Discuss-gnuradio] FIFO latency

[Marcus D. Leech]

I evaluated latency of a FIFO (actually an ordinary pipe, but the kernel 
mechanisms are identical), and measured 30usecs average on my
  1.2GHz AMD Phenom system with plenty 'o memory.

I sent timestamps across the FIFO (struct timeval), and the reader 
grabbed the local time of day, and computed the difference.  There's
  a fair amount of uncertainty on the reader due to gettimeofday() call 
overhead.  But 30usec on a wimpy CPU is certainly comfortably
  below 1msec.


--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org