From 32d50f55b75651021f036d0e5d4703ed46557e73 Mon Sep 17 00:00:00 2001
From: flywukong <19421226+flywukong@users.noreply.github.com>
Date: Wed, 12 Nov 2025 17:24:12 +0800
Subject: [PATCH 1/2] eth: improve prefetch by using cached reader

---
 core/state_prefetcher.go | 2 +-
 miner/bid_simulator.go   | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/core/state_prefetcher.go b/core/state_prefetcher.go
index 4f71e33cb1..20925560ca 100644
--- a/core/state_prefetcher.go
+++ b/core/state_prefetcher.go
@@ -66,7 +66,7 @@ func (p *statePrefetcher) Prefetch(transactions types.Transactions, header *type
 
 	// Iterate over and process the individual transactions
 	for i, tx := range transactions {
-		stateCpy := statedb.CopyDoPrefetch() // closure
+		stateCpy := statedb.StateForPrefetch() // lightweight state for prefetch with shared cache
 		workers.Go(func() error {
 			// If block precaching was interrupted, abort
 			if interrupt != nil && interrupt.Load() {
diff --git a/miner/bid_simulator.go b/miner/bid_simulator.go
index b81ab2614e..9bcb6a1da3 100644
--- a/miner/bid_simulator.go
+++ b/miner/bid_simulator.go
@@ -771,8 +771,7 @@ func (b *bidSimulator) simBid(interruptCh chan int32, bidRuntime *BidRuntime) {
 	if len(bidRuntime.bid.Txs) > prefetchTxNumber {
 		var interrupt atomic.Bool
 		defer interrupt.Store(true) // terminate the prefetch at the end
-		// TODO(Nathan): use ReadersWithCacheStats to accelerate
-		throwaway := bidRuntime.env.state.CopyDoPrefetch()
+		throwaway := bidRuntime.env.state.StateForPrefetch()
 		// Disable tracing for prefetcher executions.
 		vmCfg := *b.chain.GetVMConfig()
 		vmCfg.Tracer = nil

From d3e91a65e41f969790b260c8b862661fb1d8b3fe Mon Sep 17 00:00:00 2001
From: flywukong <19421226+flywukong@users.noreply.github.com>
Date: Wed, 19 Nov 2025 17:23:52 +0800
Subject: [PATCH 2/2] revert the copyDoPrefetch

---
 core/state_prefetcher.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/state_prefetcher.go b/core/state_prefetcher.go
index 20925560ca..68fb444188 100644
--- a/core/state_prefetcher.go
+++ b/core/state_prefetcher.go
@@ -66,7 +66,7 @@ func (p *statePrefetcher) Prefetch(transactions types.Transactions, header *type
 
 	// Iterate over and process the individual transactions
 	for i, tx := range transactions {
-		stateCpy := statedb.StateForPrefetch() // lightweight state for prefetch with shared cache
+		stateCpy := statedb.CopyDoPrefetch()
 		workers.Go(func() error {
 			// If block precaching was interrupted, abort
 			if interrupt != nil && interrupt.Load() {