Add experimental knob for tuning PoH pinned CPU core (bp #14330) (#14341)

* core: Update stale error message

(cherry picked from commit 82f61c0c4a)

* validator: Add experimental flag to select PoH pinned core

(cherry picked from commit fe667db910)

Co-authored-by: Trent Nelson <trent@solana.com>

core/src/validator.rs

@@ -16,7 +16,7 @@ use crate::{
         OptimisticallyConfirmedBank, OptimisticallyConfirmedBankTracker,
     },
     poh_recorder::{PohRecorder, GRACE_TICKS_FACTOR, MAX_GRACE_SLOTS},
-    poh_service::PohService,
+    poh_service::{self, PohService},
     rewards_recorder_service::{RewardsRecorderSender, RewardsRecorderService},
     rpc::JsonRpcConfig,
     rpc_pubsub_service::{PubSubConfig, PubSubService},
@@ -116,6 +116,7 @@ pub struct ValidatorConfig {
     pub send_transaction_retry_ms: u64,
     pub send_transaction_leader_forward_count: u64,
     pub no_poh_speed_test: bool,
+    pub poh_pinned_cpu_core: usize,
 }
 
 impl Default for ValidatorConfig {
@@ -159,6 +160,7 @@ impl Default for ValidatorConfig {
             send_transaction_retry_ms: 2000,
             send_transaction_leader_forward_count: 2,
             no_poh_speed_test: true,
+            poh_pinned_cpu_core: poh_service::DEFAULT_PINNED_CPU_CORE,
         }
     }
 }
@@ -547,6 +549,7 @@ impl Validator {
             &poh_config,
             &exit,
             bank.ticks_per_slot(),
+            config.poh_pinned_cpu_core,
         );
         assert_eq!(
             blockstore.new_shreds_signals.len(),
@@ -787,7 +790,7 @@ fn check_poh_speed(genesis_config: &GenesisConfig, maybe_hash_samples: Option<u6
             info!("PoH speed check: Will sleep {}ns per slot.", extra_ns);
         } else {
             error!(
-                "PoH is slower than cluster target tick rate! mine: {} cluster: {}. If you wish to continue, try --ignore-poh-speed",
+                "PoH is slower than cluster target tick rate! mine: {} cluster: {}. If you wish to continue, try --no-poh-speed-test",
                 my_ns_per_slot, target_ns_per_slot,
             );
             abort();