diff --git a/ggml/src/ggml-vulkan/ggml-vulkan.cpp b/ggml/src/ggml-vulkan/ggml-vulkan.cpp
index dcdfc3ac9..6696f122f 100644
--- a/ggml/src/ggml-vulkan/ggml-vulkan.cpp
+++ b/ggml/src/ggml-vulkan/ggml-vulkan.cpp
@@ -17945,6 +17945,7 @@ static bool ggml_backend_vk_register_host_buffer(void * buffer, size_t size) {
     }
 
     bool success = false;
+    size_t total_registered = 0;
     for (size_t i = 0; i < GGML_VK_MAX_DEVICES; i++) {
         vk_device& device = vk_instance.devices[i];
         if (!device || !device->external_memory_host || device->max_buffer_size == 0) {
@@ -17960,10 +17961,12 @@ static bool ggml_backend_vk_register_host_buffer(void * buffer, size_t size) {
         uint8_t * p = static_cast<uint8_t *>(buffer);
         size_t remaining = size;
         bool dev_success = false;
+        size_t n_chunks = 0;
         while (remaining > 0) {
             size_t cur = std::min(remaining, chunk);
             vk_buffer buf = ggml_vk_buffer_from_host_ptr(device, p, cur);
             if (!buf || !buf->buffer) {
+                fprintf(stderr, "PROBE chunk import FAILED at offset %zu cur=%zu remaining=%zu\n", (size_t)(p - (uint8_t*)buffer), cur, remaining);
                 break;
             }
             {
@@ -17971,9 +17974,12 @@ static bool ggml_backend_vk_register_host_buffer(void * buffer, size_t size) {
                 device->pinned_memory.emplace_back(p, cur, buf);
             }
             dev_success = true;
+            total_registered += cur;
+            n_chunks++;
             p += cur;
             remaining -= cur;
         }
+        fprintf(stderr, "PROBE device[%zu] registered %zu chunks %.2f MiB (of %.2f MiB)\n", i, n_chunks, (total_registered)/1048576.0, size/1048576.0);
         if (dev_success) {
             success = true;
         }