net: Add UDP multicast support

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 4fd025126925eb6fd75910608530b8f8c20ba27f..3791e7d52af3da59b9ca7bcad47eb56e33c94fe0 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -1438,7 +1438,8 @@ that defines them is selected.
 [netsplice] hostname=str
 [net] hostname=str The host name or IP address to use for TCP or UDP based IO.
                If the job is a TCP listener or UDP reader, the hostname is not
-               used and must be omitted.
+               used and must be omitted unless it is a valid UDP multicast
+               address.
 
 [netsplice] port=int
 [net] port=int The TCP or UDP port to bind to or connect to.
@@ -1463,7 +1464,7 @@ 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 Normal a network writer will just continue writing data, and
+[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,
                then wait for the reader to send the same payload back. This
@@ -1471,6 +1472,9 @@ that defines them is selected.
                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.
+               For UDP multicast traffic pingpong=1 should only be set for a
+               single reader when multiple readers are listening to the same
+               address.
 
 [e4defrag] donorname=str
                File will be used as a block donor(swap extents between files)