From eda9d65fe082f28897267c91b901589affcb6817 Mon Sep 17 00:00:00 2001
From: Allan Liu <aliu@tenstorrent.com>
Date: Fri, 20 Dec 2024 04:57:19 +0000
Subject: [PATCH] Reserve vector in cluster function

---
 tt_metal/llrt/tt_cluster.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tt_metal/llrt/tt_cluster.cpp b/tt_metal/llrt/tt_cluster.cpp
index 28e70c2937e..cc93cc44934 100644
--- a/tt_metal/llrt/tt_cluster.cpp
+++ b/tt_metal/llrt/tt_cluster.cpp
@@ -982,6 +982,7 @@ void Cluster::set_internal_routing_info_for_ethernet_cores(bool enable_internal_
     std::vector<chip_id_t> non_mmio_devices;
     std::vector<chip_id_t> mmio_devices = target_mmio_devices;
     if (mmio_devices.size() == 0) {
+        mmio_devices.reserve(tt::Cluster::instance().number_of_pci_devices());
         for (const auto &[assoc_mmio_device, devices] : this->devices_grouped_by_assoc_mmio_device_) {
             mmio_devices.emplace_back(assoc_mmio_device);
         }