X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=fio.1;h=22c32fd0f59c1deeba9b96bd3f563064485c7b52;hb=60f32acb9b1cafd9865d5ea36e5a8a63240a9074;hp=7c622938b1360cbd7497c605fa891d5831b26857;hpb=e8b1961dd3470be277d31d3ddd6eeef885c1cfe2;p=fio.git

diff --git a/fio.1 b/fio.1
index 7c622938..22c32fd0 100644
--- a/fio.1
+++ b/fio.1
@@ -486,8 +486,8 @@ transfer as fio ioengine
 .B e4defrag
 IO engine that does regular EXT4_IOC_MOVE_EXT ioctls to simulate defragment activity
 request to DDIR_WRITE event
-.TP
 .RE
+.P
 .RE
 .TP
 .BI iodepth \fR=\fPint
@@ -1027,6 +1027,27 @@ given time in milliseconds.
 .BI disk_util \fR=\fPbool
 Generate disk utilization statistics if the platform supports it. Default: true.
 .TP
+.BI clocksource \fR=\fPstr
+Use the given clocksource as the base of timing. The supported options are:
+.RS
+.TP
+.B gettimeofday
+gettimeofday(2)
+.TP
+.B clock_gettime
+clock_gettime(2)
+.TP
+.B cpu
+Internal CPU clock source
+.TP
+.RE
+.P
+\fBcpu\fR is the preferred clocksource if it is reliable, as it is very fast
+(and fio is heavy on time calls). Fio will automatically use this clocksource
+if it's supported and considered reliable on the system it is running on,
+unless another clocksource is specifically set. For x86/x86-64 CPUs, this
+means supporting TSC Invariant.
+.TP
 .BI gtod_reduce \fR=\fPbool
 Enable all of the gettimeofday() reducing options (disable_clat, disable_slat,
 disable_bw) plus reduce precision of the timeout somewhat to really shrink the
@@ -1162,6 +1183,15 @@ 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