extends Turbine fanout experiment to wider fanout values

Based on previous Turbine fanout experiment, wider fanouts are more effective in propagating shreds and reducing repairs: https://discord.com/channels/428295358100013066/478692221441409024/1265782094211321897 In order to identify optimal fanout value, this commit extends the experiment with wider fanout values.
anza-xyz · Aug 5, 2024 · 5cb3e10 · 5cb3e10
1 parent 42422f2
commit 5cb3e10
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Showing 2 changed files with 29 additions and 15 deletions.
diff --git a/sdk/src/feature_set.rs b/sdk/src/feature_set.rs
@@ -841,6 +841,10 @@ pub mod vote_only_retransmitter_signed_fec_sets {
     solana_sdk::declare_id!("RfEcA95xnhuwooVAhUUksEJLZBF7xKCLuqrJoqk4Zph");
 }
 
+pub mod enable_turbine_extended_fanout_experiments {
+    solana_sdk::declare_id!("BZn14Liea52wtBwrXUxTv6vojuTTmfc7XGEDTXrvMD7b");
+}
+
 lazy_static! {
     /// Map of feature identifiers to user-visible description
     pub static ref FEATURE_NAMES: HashMap<Pubkey, &'static str> = [
@@ -1046,6 +1050,7 @@ lazy_static! {
         (move_stake_and_move_lamports_ixs::id(), "Enable MoveStake and MoveLamports stake program instructions #1610"),
         (ed25519_precompile_verify_strict::id(), "Use strict verification in ed25519 precompile SIMD-0152"),
         (vote_only_retransmitter_signed_fec_sets::id(), "vote only on retransmitter signed fec sets"),
+        (enable_turbine_extended_fanout_experiments::id(), "enable turbine extended fanout experiments #"),
         /*************** ADD NEW FEATURES HERE ***************/
     ]
     .iter()

diff --git a/turbine/src/cluster_nodes.rs b/turbine/src/cluster_nodes.rs
@@ -564,8 +564,31 @@ pub fn make_test_cluster<R: Rng>(
 }
 
 pub(crate) fn get_data_plane_fanout(shred_slot: Slot, root_bank: &Bank) -> usize {
-    if enable_turbine_fanout_experiments(shred_slot, root_bank) {
+    if check_feature_activation(
+        &feature_set::disable_turbine_fanout_experiments::id(),
+        shred_slot,
+        root_bank,
+    ) {
+        DATA_PLANE_FANOUT
+    } else if check_feature_activation(
+        &feature_set::enable_turbine_extended_fanout_experiments::id(),
+        shred_slot,
+        root_bank,
+    ) {
         // Allocate ~2% of slots to turbine fanout experiments.
+        match shred_slot % 359 {
+            11 => 1152,
+            61 => 1280,
+            111 => 1024,
+            161 => 1408,
+            211 => 896,
+            261 => 1536,
+            311 => 768,
+            _ => DATA_PLANE_FANOUT,
+        }
+    } else {
+        // feature_set::enable_turbine_fanout_experiments
+        // is already activated on all clusters.
         match shred_slot % 359 {
             11 => 64,
             61 => 768,
@@ -576,23 +599,9 @@ pub(crate) fn get_data_plane_fanout(shred_slot: Slot, root_bank: &Bank) -> usize
             311 => 384,
             _ => DATA_PLANE_FANOUT,
         }
-    } else {
-        DATA_PLANE_FANOUT
     }
 }
 
-fn enable_turbine_fanout_experiments(shred_slot: Slot, root_bank: &Bank) -> bool {
-    check_feature_activation(
-        &feature_set::enable_turbine_fanout_experiments::id(),
-        shred_slot,
-        root_bank,
-    ) && !check_feature_activation(
-        &feature_set::disable_turbine_fanout_experiments::id(),
-        shred_slot,
-        root_bank,
-    )
-}
-
 // Returns true if the feature is effective for the shred slot.
 #[must_use]
 pub fn check_feature_activation(feature: &Pubkey, shred_slot: Slot, root_bank: &Bank) -> bool {