Round Times: Set minimum dynamic filter timeout to 2500ms. (#5853)

2 files changed, 10 insertions, 1 deletions

diff --git a/agreement/dynamicFilterTimeoutParams.go b/agreement/dynamicFilterTimeoutParams.go
index 36348615b..8b02bf082 100644
--- a/agreement/dynamicFilterTimeoutParams.go
+++ b/agreement/dynamicFilterTimeoutParams.go
@@ -31,7 +31,7 @@ const dynamicFilterCredentialArrivalHistory int = 40
 
 // DynamicFilterTimeoutLowerBound specifies a minimal duration that the
 // filter timeout must meet.
-const dynamicFilterTimeoutLowerBound time.Duration = 500 * time.Millisecond
+const dynamicFilterTimeoutLowerBound time.Duration = 2500 * time.Millisecond
 
 // DynamicFilterTimeoutCredentialArrivalHistoryIdx specified which sample to use
 // out of a sorted DynamicFilterCredentialArrivalHistory-sized array of time
diff --git a/agreement/router.go b/agreement/router.go
index 6ab144470..86b9a1877 100644
--- a/agreement/router.go
+++ b/agreement/router.go
@@ -59,7 +59,16 @@ var credentialRoundLag round
 
 func init() {
 	// credential arrival time should be at most 2*config.Protocol.SmallLambda after it was sent
+	// Note that the credentialRoundLag is inversely proportional to the dynamicFilterTimeoutLowerBound
+	// in the default formula. Since we are adjusting this lower bound over time,
+	// for consistency in analytics we are setting the minimum to be 8 rounds
+	// (equivalent to a dynamicFilterTimeoutLowerBound of 500 ms).
+	minCredentialRoundLag := round(8) // round 2*2000ms / 500ms
 	credentialRoundLag = round(2 * config.Protocol.SmallLambda / dynamicFilterTimeoutLowerBound)
+
+	if credentialRoundLag < minCredentialRoundLag {
+		credentialRoundLag = minCredentialRoundLag
+	}
 	if credentialRoundLag*round(dynamicFilterTimeoutLowerBound) < round(2*config.Protocol.SmallLambda) {
 		credentialRoundLag++
 	}