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[Discuss-gnuradio] FIFO latency

From: Marcus D. Leech
Subject: [Discuss-gnuradio] FIFO latency
Date: Sat, 28 May 2011 14:06:35 -0400
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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

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