diff --git a/src/kv_cli.cpp b/src/kv_cli.cpp
index e71f38f9..ab2e3718 100644
--- a/src/kv_cli.cpp
+++ b/src/kv_cli.cpp
@@ -255,9 +255,13 @@ void kv_cli_t::handle_cmd(const std::string & cmd, std::function<void()> cb)
             key != "kv_allocate_blocks" &&
             key != "kv_evict_max_misses" &&
             key != "kv_evict_attempts_per_level" &&
-            key != "kv_evict_unused_age")
+            key != "kv_evict_unused_age" &&
+            key != "kv_log_level")
         {
-            fprintf(stderr, "Allowed properties: kv_memory_limit, kv_allocate_blocks, kv_evict_max_misses, kv_evict_attempts_per_level, kv_evict_unused_age\n");
+            fprintf(
+                stderr, "Allowed properties: kv_memory_limit, kv_allocate_blocks,"
+                " kv_evict_max_misses, kv_evict_attempts_per_level, kv_evict_unused_age, kv_log_level\n"
+            );
         }
         else
         {
diff --git a/src/kv_db.cpp b/src/kv_db.cpp
index ba89c910..22d4bd25 100644
--- a/src/kv_db.cpp
+++ b/src/kv_db.cpp
@@ -133,6 +133,7 @@ struct kv_db_t
     uint64_t evict_max_misses = 10;
     uint64_t evict_attempts_per_level = 3;
     uint64_t allocate_blocks = 4;
+    uint64_t log_level = 1;
 
     // state
     uint64_t evict_unused_counter = 0;
@@ -533,6 +534,7 @@ void kv_db_t::set_config(json11::Json cfg)
     this->evict_unused_age = cfg["kv_evict_unused_age"].is_null() ? 1000 : cfg["kv_evict_unused_age"].uint64_value();
     this->cache_max_blocks = this->memory_limit / this->kv_block_size;
     this->allocate_blocks = cfg["kv_allocate_blocks"].uint64_value() ? cfg["kv_allocate_blocks"].uint64_value() : 4;
+    this->log_level = !cfg["kv_log_level"].is_null() ? cfg["kv_log_level"].uint64_value() : 1;
 }
 
 void kv_db_t::close(std::function<void()> cb)
@@ -964,9 +966,13 @@ int kv_op_t::handle_block(int res, bool updated, bool stop_on_split)
         // We may read P on step (1), get a link to A, and read A on step (4).
         // It will miss data from [c, b).
         // Retry once. If we don't see any updates after retrying - fail with EILSEQ.
-        fprintf(stderr, "K/V: %sgot unrelated block %lu: key=%s range=[%s, %s) from=[%s, %s)\n",
-            !this->updated && this->retry > 0 ? "Error: " : "Warning: read/update collision: ",
-            cur_block, key.c_str(), blk->key_ge.c_str(), blk->key_lt.c_str(), prev_key_ge.c_str(), prev_key_lt.c_str());
+        bool fatal = !this->updated && this->retry > 0;
+        if (fatal || db->log_level > 0)
+        {
+            fprintf(stderr, "K/V: %sgot unrelated block %lu: key=%s range=[%s, %s) from=[%s, %s)\n",
+                fatal ? "Error: " : "Warning: read/update collision: ",
+                cur_block, key.c_str(), blk->key_ge.c_str(), blk->key_lt.c_str(), prev_key_ge.c_str(), prev_key_lt.c_str());
+        }
         if (this->updated)
         {
             this->updated = false;
diff --git a/src/kv_stress.cpp b/src/kv_stress.cpp
index 29033076..b0eb9cf5 100644
--- a/src/kv_stress.cpp
+++ b/src/kv_stress.cpp
@@ -61,7 +61,7 @@ public:
     uint64_t max_value_len = 300;
     uint64_t print_stats_interval = 1;
     bool json_output = false;
-    bool trace = true;
+    bool trace = false;
     bool stop_on_error = false;
     // FIXME: Multiple clients
     kv_test_stat_t stat, prev_stat;
@@ -153,8 +153,6 @@ json11::Json::object kv_test_t::parse_args(int narg, const char *args[])
                 "    Print operation statistics every this number of seconds\n"
                 "  --json\n"
                 "    JSON output\n"
-                "  --trace 1\n"
-                "    Print all executed operations\n"
                 "  --stop_on_error 0\n"
                 "    Stop on first execution error, mismatch, lost key or extra key during listing\n"
                 "  --kv_memory_limit 128M\n"
@@ -168,7 +166,9 @@ json11::Json::object kv_test_t::parse_args(int narg, const char *args[])
                 "    Retry eviction at most this number of times per tree level, starting\n"
                 "    with bottom-most levels\n"
                 "  --kv_evict_unused_age 1000\n"
-                "    Evict only keys unused during this number of last operations\n",
+                "    Evict only keys unused during this number of last operations\n"
+                "  --kv_log_level 1\n"
+                "    Log level. 0 = errors, 1 = warnings, 10 = trace operations\n",
                 exe_name
             );
             exit(0);
@@ -216,8 +216,6 @@ void kv_test_t::parse_config(json11::Json cfg)
         print_stats_interval = cfg["print_stats"].uint64_value();
     if (!cfg["json"].is_null())
         json_output = true;
-    if (!cfg["trace"].is_null())
-        trace = cfg["trace"].bool_value();
     if (!cfg["stop_on_error"].is_null())
         stop_on_error = cfg["stop_on_error"].bool_value();
     if (!cfg["kv_memory_limit"].is_null())
@@ -230,6 +228,11 @@ void kv_test_t::parse_config(json11::Json cfg)
         kv_cfg["kv_evict_attempts_per_level"] = cfg["kv_evict_attempts_per_level"];
     if (!cfg["kv_evict_unused_age"].is_null())
         kv_cfg["kv_evict_unused_age"] = cfg["kv_evict_unused_age"];
+    if (!cfg["kv_log_level"].is_null())
+    {
+        trace = cfg["kv_log_level"].uint64_value() >= 10;
+        kv_cfg["kv_log_level"] = cfg["kv_log_level"];
+    }
     total_prob = reopen_prob+get_prob+add_prob+update_prob+del_prob+list_prob;
     stat.get.name = "get";
     stat.add.name = "add";