diff --git a/ggml/src/ggml-vulkan/ggml-vulkan.cpp b/ggml/src/ggml-vulkan/ggml-vulkan.cpp
index 0a79310..9980031 100644
--- a/ggml/src/ggml-vulkan/ggml-vulkan.cpp
+++ b/ggml/src/ggml-vulkan/ggml-vulkan.cpp
@@ -108,6 +108,7 @@ static bool is_pow2(uint32_t x) { return x > 1 && (x & (x-1)) == 0; }
 #define VK_VENDOR_ID_INTEL 0x8086
 #define VK_VENDOR_ID_NVIDIA 0x10de
 #define VK_VENDOR_ID_QUALCOMM 0x5143
+#define VK_VENDOR_ID_ARM 0x13B5
 
 #define VK_DEVICE_DESCRIPTOR_POOL_SIZE 256
 
@@ -2612,8 +2613,14 @@ static void ggml_vk_command_pool_cleanup(vk_device& device, vk_command_pool& p)
 static void ggml_vk_queue_command_pools_cleanup(vk_device& device) {
     VK_LOG_DEBUG("ggml_vk_queue_command_pools_cleanup()");
 
-    // Arbitrary frequency to cleanup/reuse command buffers
-    static constexpr uint32_t cleanup_frequency = 10;
+    // Arbitrary frequency to cleanup/reuse command buffers.
+    // rocky-vulkan-llama: env-tunable. panvk's small (~4GB) priv VA heap OOMs when many
+    // cmdbufs (each retaining a large per-cmdbuf TLS/WLS BO) accumulate before reset;
+    // GGML_VK_CMD_CLEANUP_FREQ lowers the accumulation bound on Mali/panvk.
+    static const uint32_t cleanup_frequency = []() {
+        const char *e = getenv("GGML_VK_CMD_CLEANUP_FREQ");
+        return e ? (uint32_t)atoi(e) : 10u;
+    }();
 
     if (device->compute_queue.cmd_pool.buffers_in_use() >= cleanup_frequency) {
         ggml_vk_command_pool_cleanup(device, device->compute_queue.cmd_pool);
@@ -3411,6 +3418,26 @@ static void ggml_vk_load_shaders(vk_device& device) {
             l_warptile_mmq = { 512, 128, 128, 32, subgroup_size_8, 32, 2, tm_m, tn_m, tk_m, subgroup_size_8 };
         }
 
+        // rocky-vulkan-llama Iteration 1: Mali/panvk (Mali-G610, subgroup=16,
+        // no coopmat). The stock L tile computes WM*WN/WARP accumulators/thread
+        // (L: 32*64/16 = 128) which spill ~5328 B/thread to the TLS stack on
+        // Mali's small register file -> occupancy collapse at ub>64 (5.8 t/s vs
+        // 21 @ ub64). Shrink ONLY the L-variant to a spill-free 16-accumulator
+        // tile (WM=WN=16, WARP=16 -> 256/16 = 16 acc). M/S are left stock, so
+        // ub<=64 keeps the M path as the 21 t/s control. BM=64, BN=32,
+        // BK=32 (quant) / 16 (base); 8 warps * 16 = BLOCK 128; WNITER=4.
+        const bool is_mali =
+            (device->vendor_id == VK_VENDOR_ID_ARM) ||
+            (device->subgroup_size == 16 && !device->coopmat_support &&
+             !device->coopmat2 && device->vendor_id != VK_VENDOR_ID_INTEL);
+        if (is_mali) {
+            //                       BLK  BM  BN  BK  WM  WN  WMI TM TN TK WARP
+            l_warptile           = { 128, 64, 32, 16, 16, 16, 1, 2, 2, 1, 16 };
+            l_warptile_mmq       = { 128, 64, 32, 32, 16, 16, 1, 2, 2, 1, 16 };
+            l_warptile_mmq_int   = { 128, 64, 32, 32, 16, 16, 1, 2, 2, 1, 16 };
+            l_warptile_mmq_int_k = { 128, 64, 32, 32, 16, 16, 1, 2, 2, 1, 16 };
+        }
+
         l_mmq_wg_denoms = l_wg_denoms = {128, 128, 1 };
         m_mmq_wg_denoms = m_wg_denoms = { 64,  64, 1 };
         s_mmq_wg_denoms = s_wg_denoms = { 32,  32, 1 };
@@ -3418,6 +3445,13 @@ static void ggml_vk_load_shaders(vk_device& device) {
         m_align =  64;
         s_align =  32;
 
+        if (is_mali) {
+            // Match the shrunk L tile (BM=64, BN=32). l_warptile[_mmq/_mmq_int/
+            // _mmq_int_k] all consume l_[mmq_]wg_denoms; align tracks BN.
+            l_wg_denoms = l_mmq_wg_denoms = { 64, 32, 1 };
+            l_align = 32;
+        }
+
         for (uint32_t i = 0; i < GGML_TYPE_COUNT; ++i) {
             ggml_type t = (ggml_type)i;
             // Disable medium and large matrix multiplication if not enough shared memory is available
@@ -14684,11 +14718,14 @@ static ggml_status ggml_backend_vk_graph_compute(ggml_backend_t backend, ggml_cg
     // (and scaled down based on model size, so smaller models submit earlier).
     // Also submit at least every 100 nodes, in case there are workloads without as much matmul.
     int nodes_per_submit = 100;
+    if (const char* e = getenv("GGML_VK_NODES_PER_SUBMIT")) { nodes_per_submit = atoi(e); }
     int submitted_nodes = 0;
     int submit_count = 0;
     uint64_t mul_mat_bytes = 0;
     uint64_t total_mul_mat_bytes = 0;
-    uint64_t mul_mat_bytes_per_submit = std::min(uint64_t(100*1000*1000), ctx->last_total_mul_mat_bytes / 40u);
+    uint64_t mul_mat_bytes_cap = 100*1000*1000;
+    if (const char* e = getenv("GGML_VK_MAX_MUL_MAT_BYTES_PER_SUBMIT")) { mul_mat_bytes_cap = strtoull(e, nullptr, 10); }
+    uint64_t mul_mat_bytes_per_submit = std::min(mul_mat_bytes_cap, ctx->last_total_mul_mat_bytes / 40u);
     for (int i = 0; i < cgraph->n_nodes; i++) {
         if (first_node_in_batch) {
             submit_node_idx = i;
@@ -14925,7 +14962,7 @@ static ggml_status ggml_backend_vk_graph_compute(ggml_backend_t backend, ggml_cg
             submitted_nodes = 0;
             mul_mat_bytes = 0;
             if (submit_count < 3) {
-                mul_mat_bytes_per_submit *= 2;
+                mul_mat_bytes_per_submit = std::min(mul_mat_bytes_per_submit * 2, mul_mat_bytes_cap);
             }
             submit_count++;
         }