I am also confused about the topologies
which are included in the repository. The
default crossbar topology that is included
in the m5 repository generates something
along these lines:
ext_node:L1Cache:0 int_node:0
link_latency:1 bw_multiplier:64
ext_node:L1Cache:1 int_node:1
link_latency:1 bw_multiplier:64
ext_node:L1Cache:2 int_node:2
link_latency:1 bw_multiplier:64
ext_node:L1Cache:3 int_node:3
link_latency:1 bw_multiplier:64
ext_node:L2Cache:0 int_node:4
link_latency:1 bw_multiplier:64
ext_node:Directory:0 int_node:5
link_latency:40 bw_multiplier:10
int_node:0 int_node:6
link_latency:40 bw_multiplier:16
int_node:1 int_node:6 link_latency:40
bw_multiplier:16
int_node:2 int_node:6
link_latency:40 bw_multiplier:16
int_node:3 int_node:6
link_latency:40 bw_multiplier:16
int_node:4 int_node:6
link_latency:40 bw_multiplier:16
int_node:5 int_node:6
link_latency:40 bw_multiplier:16
This doesn't make sense to me. Why
is there the extra level of switches
before connecting nodes to the xbar
switch? Is it an error in the
repository or am I misunderstanding
something? Wouldn't a more proper
crossbar look like:
ext_node:L1Cache:0 int_node:0
link_latency:1 bw_multiplier:64
ext_node:L1Cache:1 int_node:0
link_latency:1 bw_multiplier:64
ext_node:L1Cache:2 int_node:0
link_latency:1 bw_multiplier:64
ext_node:L1Cache:3 int_node:0
link_latency:1 bw_multiplier:64
ext_node:L2Cache:0 int_node:0
link_latency:1 bw_multiplier:64
ext_node:Directory:0 int_node:0
link_latency:40 bw_multiplier:10
-Joseph