\subsection pf_Cr Computing resources: hosts, clusters and peers.
-\subsubsection pf_host <host/>
+\subsubsection pf_host <host>
A <b>host</b> represents a computer/node card. Every host is able to execute
code and it can send and receive data to/from other hosts. Most importantly,
etc.
-\subsubsection pf_peer The <peer> tag
+\subsubsection pf_peer \<peer\> (Vivaldi netzones only)
This tag represents a peer, as in Peer-to-Peer (P2P) networks. This
-can only be used in Vivaldi NetZones. It creates the following
+can only be used in Vivaldi NetZones. It creates the following
resources to the NetZone:
\li A host
speed | yes | int | See the description of the ``host`` tag for this attribute
bw_in | yes | int | Bandwidth of the private downstream link
bw_out | yes | int | Bandwidth of the private upstream link
-lat | yes | double | Latency for both up- and downstream, in seconds.
coordinates | no | string | Coordinates of the gateway for this peer. Example value: 12.8 14.4 6.4
sharing_policy | no | SHARED\|FULLDUPLEX (default: FULLDUPLEX) | Sharing policy for links. See <b>link</b> description for details.
availability_file| no | string | Availability file for the peer. Same as host availability file. See <b>host</b> description for details.
state_file | no | string | State file for the peer. Same as host state file. See <b>host</b> description for details.
+
+The communication latency between an host A=(xA,yA,zA) and an host
+B=(xB,yB,zB) is computed as follows:
+
+ latency = sqrt( (xA-xB)² + (yA-yB)² ) + zA + zB
+
+See the documentation of simgrid::kernel::routing::VivaldiZone for
+details on how the latency is computed from the coordinate, and on the
+the up and down bandwidth are used.
+
\subsection pf_ne Network equipments: links and routers
There are two tags at all times available to represent network entities and
