Adding PacketRecord to PSRAM as well as part of this change.

src/mesh/MemoryPool.h

@@ -228,4 +228,27 @@ template <class T, int MaxSize> class PsramMemoryPool : public Allocator<T>
         return nullptr;
     }
 };
+
+// Utility helpers for PSRAM-backed array allocations on ESP32 targets.
+template <typename T> inline T *psramAllocArray(size_t count)
+{
+    return static_cast<T *>(heap_caps_malloc(sizeof(T) * count, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT));
+}
+
+template <typename T> inline void psramFreeArray(T *ptr)
+{
+    if (ptr)
+        heap_caps_free(ptr);
+}
+#else
+template <typename T> inline T *psramAllocArray(size_t count)
+{
+    (void)count;
+    return nullptr;
+}
+
+template <typename T> inline void psramFreeArray(T *ptr)
+{
+    (void)ptr;
+}
 #endif

src/mesh/PacketHistory.cpp

@@ -1,4 +1,5 @@
 #include "PacketHistory.h"
+#include "MemoryPool.h"
 #include "configuration.h"
 #include "mesh-pb-constants.h"
 
@@ -16,7 +17,8 @@
 #define VERBOSE_PACKET_HISTORY 0     // Set to 1 for verbose logging, 2 for heavy debugging
 #define PACKET_HISTORY_TRACE_AGING 1 // Set to 1 to enable logging of the age of re/used history slots
 
-PacketHistory::PacketHistory(uint32_t size) : recentPacketsCapacity(0), recentPackets(NULL) // Initialize members
+PacketHistory::PacketHistory(uint32_t size)
+    : recentPacketsCapacity(0), recentPackets(NULL), recentPacketsInPsram(false) // Initialize members
 {
     if (size < 4 || size > PACKETHISTORY_MAX) { // Copilot suggested - makes sense
         LOG_WARN("Packet History - Invalid size %d, using default %d", size, PACKETHISTORY_MAX);
@@ -25,23 +27,45 @@ PacketHistory::PacketHistory(uint32_t size) : recentPacketsCapacity(0), recentPa
 
     // Allocate memory for the recent packets array
     recentPacketsCapacity = size;
-    recentPackets = new PacketRecord[recentPacketsCapacity];
-    if (!recentPackets) { // No logging here, console/log probably uninitialized yet.
-        LOG_ERROR("Packet History - Memory allocation failed for size=%d entries / %d Bytes", size,
-                  sizeof(PacketRecord) * recentPacketsCapacity);
-        recentPacketsCapacity = 0; // mark allocation fail
-        return;                    // return early
+    if (has_psram()) {
+        // Prefer PSRAM so the large history pool stays out of internal RAM on ESP32-S3 builds.
+        recentPackets = psramAllocArray<PacketRecord>(recentPacketsCapacity);
+        if (recentPackets) {
+            memset(recentPackets, 0, sizeof(PacketRecord) * recentPacketsCapacity);
+            recentPacketsInPsram = true;
+        } else {
+            LOG_WARN("Packet History - PSRAM allocation failed, falling back to DRAM");
+        }
     }
 
-    // Initialize the recent packets array to zero
-    memset(recentPackets, 0, sizeof(PacketRecord) * recentPacketsCapacity);
+    if (!recentPackets) {
+        // Fall back to DRAM if PSRAM is unavailable or exhausted.
+        recentPackets = new PacketRecord[recentPacketsCapacity];
+        if (!recentPackets) { // No logging here, console/log probably uninitialized yet.
+            LOG_ERROR("Packet History - Memory allocation failed for size=%d entries / %d Bytes", size,
+                      sizeof(PacketRecord) * recentPacketsCapacity);
+            recentPacketsCapacity = 0; // mark allocation fail
+            return;                    // return early
+        }
+
+        // Initialize the recent packets array to zero
+        memset(recentPackets, 0, sizeof(PacketRecord) * recentPacketsCapacity);
+    }
 }
 
 PacketHistory::~PacketHistory()
 {
-    recentPacketsCapacity = 0;
-    delete[] recentPackets;
+    if (recentPackets) {
+        // Release via the allocator that produced the buffer.
+        if (recentPacketsInPsram)
+            psramFreeArray(recentPackets);
+        else
+            delete[] recentPackets;
+    }
+
     recentPackets = NULL;
+    recentPacketsCapacity = 0;
+    recentPacketsInPsram = false;
 }
 
 /** Update recentPackets and return true if we have already seen this packet */
@@ -458,4 +482,4 @@ inline uint8_t PacketHistory::getOurTxHopLimit(PacketRecord &r)
 inline void PacketHistory::setOurTxHopLimit(PacketRecord &r, uint8_t hopLimit)
 {
     r.hop_limit = (r.hop_limit & ~HOP_LIMIT_OUR_TX_MASK) | ((hopLimit << HOP_LIMIT_OUR_TX_SHIFT) & HOP_LIMIT_OUR_TX_MASK);
-}
+}

src/mesh/PacketHistory.h

@@ -27,6 +27,7 @@ class PacketHistory
     uint32_t recentPacketsCapacity =
         0; // Can be set in constructor, no need to recompile. Used to allocate memory for mx_recentPackets.
     PacketRecord *recentPackets = NULL; // Simple and fixed in size. Debloat.
+    bool recentPacketsInPsram = false;  // Remember backing store so we free via the matching allocator.
 
     /** Find a packet record in history.
      * @param sender NodeNum