[gem5-users] Garnet3.0: huge latency of packets

赵子丰 Mon, 26 Sep 2022 20:04:24 -0700

Dear all,
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_latency&nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp;6250&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;(Unspecified)
system.ruby.network.average_flit_network_latency&nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp;5250&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;(Unspecified)
system.ruby.network.average_flit_queueing_latency&nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp;1000&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;(Unspecified)
system.ruby.network.average_flit_vnet_latency |&nbsp; &nbsp; &nbsp; &nbsp; 
5250&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;|&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;nan&nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|&nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;nan&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp; &nbsp;(Unspecified)
system.ruby.network.average_flit_vqueue_latency |&nbsp; &nbsp; &nbsp; &nbsp; 
1000&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;|&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;nan&nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|&nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;nan&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp; &nbsp;(Unspecified)
system.ruby.network.average_hops&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp;3.750000&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp; &nbsp;(Unspecified)
system.ruby.network.average_packet_latency&nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp;6250&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;(Unspecified)
system.ruby.network.average_packet_network_latency&nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp;5250&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;(Unspecified)
system.ruby.network.average_packet_queueing_latency&nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp;1000&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;(Unspecified)
system.ruby.network.average_packet_vnet_latency |&nbsp; &nbsp; &nbsp; &nbsp; 
5250&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;|&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;nan&nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|&nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;nan&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp; &nbsp;(Unspecified)
system.ruby.network.average_packet_vqueue_latency |&nbsp; &nbsp; &nbsp; &nbsp; 
1000&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;|&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;nan&nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|&nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;nan&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp; &nbsp;(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&nbsp; &nbsp; &nbsp;|&nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp; 10&nbsp; &nbsp; 100.00%&nbsp; &nbsp; 100.00% |&nbsp; &nbsp; 
&nbsp; &nbsp; &nbsp; &nbsp;0&nbsp; &nbsp; &nbsp; 0.00%&nbsp; &nbsp; 100.00% 
|&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0&nbsp; &nbsp; &nbsp; 0.00%&nbsp; 
&nbsp; 100.00% (Unspecified)
system.ruby.network.packets_injected::total&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp;10&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp;(Unspecified)
system.ruby.network.packets_received&nbsp; &nbsp; &nbsp;|&nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp; &nbsp;4&nbsp; &nbsp; 100.00%&nbsp; &nbsp; 100.00% |&nbsp; &nbsp; 
&nbsp; &nbsp; &nbsp; &nbsp;0&nbsp; &nbsp; &nbsp; 0.00%&nbsp; &nbsp; 100.00% 
|&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0&nbsp; &nbsp; &nbsp; 0.00%&nbsp; 
&nbsp; 100.00% (Unspecified)
system.ruby.network.packets_received::total&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; 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&nbsp; 
--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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[gem5-users] Garnet3.0: huge latency of packets

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