diff --git a/src/net/include/thread_pool.h b/src/net/include/thread_pool.h
index fed8f42ddb..8d20957194 100644
--- a/src/net/include/thread_pool.h
+++ b/src/net/include/thread_pool.h
@@ -113,7 +113,7 @@ class ThreadPool : public pstd::noncopyable {
 
   uint16_t task_idx_;
 
-  const uint8_t nworkers_per_link_ = 2;  // numer of workers per link
+  const uint8_t nworkers_per_link_ = 1;  // numer of workers per link
   const uint8_t nlinks_;                 // number of links (upper around)
   std::vector<std::atomic<Node*>> newest_node_;
   std::atomic<int> node_cnt_;  // for task
diff --git a/src/net/src/thread_pool.cc b/src/net/src/thread_pool.cc
index 5f067b1148..c37f08df15 100644
--- a/src/net/src/thread_pool.cc
+++ b/src/net/src/thread_pool.cc
@@ -52,7 +52,7 @@ ThreadPool::ThreadPool(size_t worker_num, size_t max_queue_size, std::string thr
       node_cnt_(0),
       time_newest_node_(nlinks_),
       time_node_cnt_(0),
-      queue_slow_size_(std::min(worker_num * 10, max_queue_size)),
+      queue_slow_size_(std::max(10UL, std::min(worker_num * max_queue_size / 100, max_queue_size))),
       max_queue_size_(max_queue_size),
       max_yield_usec_(100),
       slow_yield_usec_(3),