Increase CPU clock calibration accuracy

[fio.git] / fio.1

diff --git a/fio.1 b/fio.1
index 26a4650432132345959bbaa09006015abfff6925..b7abc4b6f97f639e024b470b721598084ed2447b 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -1162,6 +1162,15 @@ For TCP network connections, tell fio to listen for incoming
 connections rather than initiating an outgoing connection. The
 hostname must be omitted if this option is used.
 .TP
+.BI (net, pingpong) \fR=\fPbool
+Normal a network writer will just continue writing data, and a network reader
+will just consume packages. If pingpong=1 is set, a writer will send its normal
+payload to the reader, then wait for the reader to send the same payload back.
+This allows fio to measure network latencies. The submission and completion
+latencies then measure local time spent sending or receiving, and the
+completion latency measures how long it took for the other end to receive and
+send back.
+.TP
 .BI (e4defrag,donorname) \fR=\fPstr
 File will be used as a block donor (swap extents between files)
 .TP