Perf Tweaks

[gmalouf]

Summary

Set MaxConnectionsPerIP to 4, ERL should kick in when it hits the backlogCongestionThreshold congestion benchmark.

Test Plan

Existing tests should pass, node should run successfully in functional tests.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 56.26%. Comparing base (eff5fb4) to head (0e9dff2).
Report is 1 commits behind head on experimental-tweaks.

Files with missing lines	Patch %	Lines
data/txHandler.go	75.00%	0 Missing and 1 partial ⚠️
util/rateLimit.go	90.00%	1 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           experimental-tweaks    #6167      +/-   ##
=======================================================
- Coverage                56.29%   56.26%   -0.03%     
=======================================================
  Files                      494      494              
  Lines                    69958    69960       +2     
=======================================================
- Hits                     39381    39362      -19     
- Misses                   27907    27917      +10     
- Partials                  2670     2681      +11     

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[cce]

If we were to merge to master, need to also similarly update some perf test recipes like scenario3, scenario1 where there are 5 or 10 nodes per box, here are some (-n is # of nodes and -N is number of instances):

$ grep -E '\-N [0-9]+ \-n [0-9]+' */Makefile | awk '{for (i=1; i<=NF; i++) {if ($i == "-N") N=$(i+1); if ($i == "-n") n=$(i+1);} if (n / N > 1) print $0}'
devnet/Makefile:PARAMS=-w 20 -R 5 -N 5 -n 20 --node-template node.json --relay-template relay.json --non-participating-node-template nonPartNode.json
network-partition/Makefile:PARAMS=-w 100 -R 8 -N 20 -n 100 --npn-algod-nodes 10 --node-template node.json --relay-template relay.json --non-participating-node-template nonPartNode.json
scenario1/Makefile:PARAMS=-w 100 -R 8 -N 20 -n 100 --npn-algod-nodes 10 --node-template node.json --relay-template relay.json --non-participating-node-template nonPartNode.json
scenario2/Makefile:PARAMS=-w 400 -R 20 -N 40 -n 200 --npn-algod-nodes 15 --node-template node.json --relay-template relay.json --non-participating-node-template nonPartNode.json
scenario3/Makefile:PARAMS=-w 10000 -R 20 -N 100 -n 1000 --npn-algod-nodes 15 --node-template node.json --relay-template relay.json

[cce]

LGTM for an experimental branch