P3 Writes a Changing It To 5 Part II
•Processor continues to be stalled
•Px controller awaits ACKs from all those
nodes
•Px controller delivers blk to cache in dirty
state
•Total messages when
clean copy exists: ToHome, FromHome,
(Invalidate, ACK)*s
P1
a:I:4
Controller
a:4
10001
P2
$
Controller
P3
a:M:5
Controller
P0
a:I:4
Controller
Interconnection
Network
Msg: P0 to P3, ACK
Msg: P1 to P3, ACK