[Discuss-gnuradio] FIFO latency

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

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