Dear all,
(My last email content has many char '&nbsp'. In order to make it easy to
read, I delete these chars in this letter.
I am new to the Garnet model. After I followed the command on the 'garnet
synthetic traffic' website,
I found that the packets have a very high latency, like this:
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
system.ruby.network.average_flit_latency6250(Unspecified)
system.ruby.network.average_flit_network_latency5250(Unspecified)
system.ruby.network.average_flit_queueing_latency1000(Unspecified)
system.ruby.network.average_flit_vnet_latency |5250|nan|nan(Unspecified)
system.ruby.network.average_flit_vqueue_latency |1000|nan|nan(Unspecified)
system.ruby.network.average_hops3.750000(Unspecified)
system.ruby.network.average_packet_latency6250(Unspecified)
system.ruby.network.average_packet_network_latency5250(Unspecified)
system.ruby.network.average_packet_queueing_latency1000(Unspecified)
system.ruby.network.average_packet_vnet_latency |5250|nan|nan(Unspecified)
system.ruby.network.average_packet_vqueue_latency |1000|nan|nan(Unspecified)
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Then I checked the number of packets which were injected to the Mesh network.
The statistics result is listed below:
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
system.ruby.network.packets_injected|10100.00% 100.00% |0 0.00% 100.00% | 0
0.00% 100.00%(Unspecified)
system.ruby.network.packets_injected::total
10
(Unspecified)
system.ruby.network.packets_received |4 100.00% 100.00% | 0
0.00% 100.00% | 0 0.00% 100.00% (Unspecified)
system.ruby.network.packets_received::total 4
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
the command I used is:
./build/NULL/gem5.opt configs/example/garnet_synth_traffic.py --network=garnet
--num-cpus=64 --num-dirs=64
--topology=Mesh_XY --mesh-rows=8 --sim-cycles=10000 --inj-vnet=0
--injectionrate=0.02 --synthetic=uniform_random
I have tried run the cmd in gem5 v21.2.1.0 and v22.0.0.2, respectly. The result
is same.
Why so few packets can be injected to the network? And why the latency of
packets is so huge? I guess some congestion happend in the network.
Thanks a lot.
ZiFeng Zhao
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