Commit a1e7c9f8 authored by Christopher Alfeld's avatar Christopher Alfeld
Browse files

Added some text on emulated links.

parent cf06552f
......@@ -79,7 +79,7 @@ Each vlink has the amount of bandwidth is uses. Each plink has its
bandwidth capacity and two arbitrary strings which are associated with
each end. These strings are not used for any scoring purposes and are
just passed through, they are their for the use of the user. A
virtual to physical link mapping comes in one of three types. DIRECT
virtual to physical link mapping comes in one of four types. DIRECT
links represent physical wires connecting one node directly to
another. INTRASWITCH links are links that go from a node to a switch
and then from that switch to the destination node. INTERSWITCH links
......@@ -89,7 +89,10 @@ are always one to one, i.e. there is only one plink corresponding to
the vlink. In INTRASWITCH maps there are two plinks for the vlink;
one to the switch, and one from the switch. In INTERSWITCH maps there
are at least three (to the switch, at least one interconnect, and from
the final switch to the destination) and can be any number.
the final switch to the destination) and can be any number. The final
type is a TRIVIAL link. This type occurs when trying to assign a
vlink between vnodes that are in the same pnode. TRIVIAL links impose
zero cost and have no data associated with them.
For interswitch plinks (switch to switch links) any number of vlinks
can use the plink. For all other plinks only a single vlink is
......@@ -98,6 +101,9 @@ first results in a violation. Violations also occur for every vlink
that causes the used bandwidth of a plink to exceed the allowed
A vlink can be marked emulated. An emulated vlink can share a plink
with other emulated vlinks.
The switches and their interconnects are collectively called the
switch fabric. The shortest path between any two switches is
precomputed. This means that every interswitch link between the same
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