fix: optimize ib size for 3 TCP round trips (#218)

* fix: optimize ib size for 3 TCP round trips

* fix(sim-hs): test for default ibBodyAvgSizeBytes

Author: will-break-it

data/simulation/config.default.yaml

@@ -82,8 +82,8 @@ ib-shards: 1
 #       would instead more than double the total to 668.
 #       And even 828 including Op Cert.
 ib-head-size-bytes: 304
-# 100kB, using praos max size as ballpark estimate.
-ib-body-avg-size-bytes: 102400
+# 98KB to optimize for 3 TCP round trips
+ib-body-avg-size-bytes: 98304
 ib-body-max-size-bytes: 327680
 # Here we also use praos blocks as ballpark estimate.
 # Sec 2.3 Forging, of the benchmark cluster report, lists

simulation/src/LeiosProtocol/Config.hs

@@ -150,7 +150,7 @@ instance Default Config where
       , ibBodyValidationCpuTimeMsConstant = 50.0
       , ibBodyValidationCpuTimeMsPerByte = 0.0005
       , ibBodyMaxSizeBytes = 327680
-      , ibBodyAvgSizeBytes = 102400
+      , ibBodyAvgSizeBytes = 98304
       , ibDiffusionStrategy = FreshestFirst
       , ibDiffusionMaxWindowSize = 100
       , ibDiffusionMaxHeadersToRequest = 100