X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=HOWTO;h=e18eadb11811879ac20dd1272041c95d5bf2cbde;hp=693eeb11b12ac28f29804ee3776ae6570f732780;hb=8aab824f8a042e76c83902afa4a1e9a473467e29;hpb=892ea9bdd2b794ffacb2975d0b1db3e4f319f153

diff --git a/HOWTO b/HOWTO
index 693eeb11..e18eadb1 100644
--- a/HOWTO
+++ b/HOWTO
@@ -253,7 +253,20 @@ machine.
 
 This section describes in details each parameter associated with a job.
 Some parameters take an option of a given type, such as an integer or
-a string. The following types are used:
+a string. Anywhere a numeric value is required, an arithmetic expression
+may be used, provided it is surrounded by parentheses. Supported operators
+are:
+
+	addition (+)
+	subtraction (-)
+	multiplication (*)
+	division (/)
+	modulus (%)
+	exponentiation (^)
+
+For time values in expressions, units are microseconds by default. This is
+different than for time values not in expressions (not enclosed in
+parentheses). The following types are used:
 
 str	String. This is a sequence of alpha characters.
 time	Integer with possible time suffix. In seconds unless otherwise
@@ -1627,7 +1640,9 @@ that defines them is selected.
 		address.
 
 [netsplice] port=int
-[net] port=int	The TCP or UDP port to bind to or connect to.
+[net] port=int	The TCP or UDP port to bind to or connect to. If this is used
+with numjobs to spawn multiple instances of the same job type, then this will
+be the starting port number since fio will use a range of ports.
 
 [netsplice] interface=str
 [net] interface=str  The IP address of the network interface used to send or
@@ -1659,6 +1674,7 @@ that defines them is selected.
 [net] listen	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.
+
 [net] pingpong	Normaly 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,
@@ -1671,6 +1687,10 @@ that defines them is selected.
 		single reader when multiple readers are listening to the same
 		address.
 
+[net] window_size	Set the desired socket buffer size for the connection.
+
+[net] mss	Set the TCP maximum segment size (TCP_MAXSEG).
+
 [e4defrag] donorname=str
 	        File will be used as a block donor(swap extents between files)
 [e4defrag] inplace=int