diff --git a/README.md b/README.md
index 82c97db..92f1fe9 100644
--- a/README.md
+++ b/README.md
@@ -116,5 +116,5 @@ QoS provides `priority_override` as last argument for HTTP API functions, this c
   Return current QoS active requests utilization  percentage value.
 * **`/qos:utilization [priority]`**
   Return current QoS queue utilization percentage value.
-* **`/qos:clear [priority]`**
-  Return current QoS queue utilization percentage value.
+* **`/qos:clear <priority>|all`**
+  Clears selected or all queues. All queued requests are gone for good.
diff --git a/commands.lua b/commands.lua
index 225bccf..433c943 100644
--- a/commands.lua
+++ b/commands.lua
@@ -1,10 +1,37 @@
 
+local function get_priority(priority)
+	if priority then
+		priority = tonumber(priority)
+		if priority and QoS.data.queues[priority] then
+			return priority
+		end
+		return false
+	end
+end
+
+local function align(s, w)
+	s = tostring(s)
+	return s .. string.rep(' ', w - #s)
+end
+
 minetest.register_chatcommand("qos:queue_length", {
-	params = "[priority]",
+	params = "[<priority>]",
 	description = "Return current QoS queue length",
 	privs = { [QoS.config("info_priv")] = true },
 	func = function(name, priority)
-		minetest.chat_send_player(name, ("QoS current queue length: %d"):format(QoS.queue_length(tonumber(priority))))
+		priority = get_priority(priority)
+		if priority then
+			minetest.chat_send_player(name, ("QoS current queue length: %d"):format(QoS.queue_length(priority)))
+		elseif priority == false then
+			minetest.chat_send_player(name, "Invalid priority parameter, use empty or 1-"..#QoS.data.queues)
+		else
+			local rows = {}
+			for i,_ in ipairs(QoS.data.queues) do
+				table.insert(rows, (" %s %d%%"):format(align(i, 8), QoS.utilization(i)))
+			end
+			local total = QoS.queue_length()
+			minetest.chat_send_player(name, ("QoS queue length %d in:\n%s"):format(total, table.concat(rows, "\n")))
+		end
 	end
 })
 
@@ -25,34 +52,46 @@ minetest.register_chatcommand("qos:active_utilization", {
 })
 
 minetest.register_chatcommand("qos:utilization", {
-	params = "[priority]",
+	params = "[<priority>]",
 	description = "Return current QoS queue utilization percentage value",
 	privs = { [QoS.config("info_priv")] = true },
 	func = function(name, priority)
-		minetest.chat_send_player(name, ("QoS queue utilization: %d%%"):format(QoS.utilization(tonumber(priority))))
+		priority = get_priority(priority)
+		if priority then
+			minetest.chat_send_player(name, ("QoS queue utilization: %d%%"):format(QoS.utilization(priority)))
+		elseif priority == false then
+			minetest.chat_send_player(name, "Invalid priority parameter, use empty or 1-"..#QoS.data.queues)
+		else
+			local rows = {}
+			for i,_ in ipairs(QoS.data.queues) do
+				table.insert(rows, (" %s %d%%"):format(align(i, 8), QoS.utilization(i)))
+			end
+			local total = QoS.utilization()
+			minetest.chat_send_player(name, ("QoS queue utilization %d%% in:\n%s")
+				:format(total, table.concat(rows, "\n"))
+			)
+		end
 	end
 })
 
 minetest.register_chatcommand("qos:clear", {
-	params = "[priority]",
-	description = "Clear QoS queues by priority, clear all queues if piority not given",
+	params = "<priority>|all",
+	description = "Clear QoS queues by priority, clear all queues if piority is 'all'",
 	privs = { [QoS.config("admin_priv")] = true },
 	func = function(name, priority)
-		if priority and priority:find("%S") then
-			local i = tonumber(priority)
-			if i and QoS.data.queues[i] then
-				local length = QoS.data.queues[i].count
-				QoS.data.queues[i]:clear()
-				minetest.chat_send_player(name, ("QoS cleared %d priority %d entries"):format(length, i))
-			else
-				minetest.chat_send_player(name, "QoS clear: invalid priority, double check your input")
-			end
-		else
+		if priority == "all" then
 			for i, queue in ipairs(QoS.data.queues) do
 				local length = queue.count
 				queue:clear()
-				minetest.chat_send_player(name, ("QoS cleared %d priority %d entries"):format(length, i))
+				minetest.chat_send_player(name, ("QoS cleared %d entries from priority %d"):format(length, i))
 			end
+		elseif get_priority(priority) then
+			priority = get_priority(priority)
+			local length = QoS.data.queues[priority].count
+			QoS.data.queues[priority]:clear()
+			minetest.chat_send_player(name, ("QoS cleared %d entries from priority %d"):format(length, priority))
+		else
+			minetest.chat_send_player(name, "Invalid priority parameter, use 1-"..#QoS.data.queues.." or 'all'")
 		end
 	end
 })
diff --git a/spec/command_spec.lua b/spec/command_spec.lua
index 117cd21..3dde8c4 100644
--- a/spec/command_spec.lua
+++ b/spec/command_spec.lua
@@ -6,6 +6,16 @@ mineunit("common/chatcommands")
 
 sourcefile("init")
 
+-- Patch spy.on method, see https://github.com/Olivine-Labs/luassert/pull/174
+function spy.on(target_table, target_key)
+	local s = spy.new(target_table[target_key])
+	rawset(target_table, target_key, s)
+	-- store original data
+	s.target_table = target_table
+	s.target_key = target_key
+	return s
+end
+
 describe("Queue initialization", function()
 
 	it("executes qos:queue_length", function()
@@ -19,6 +29,10 @@ describe("Queue initialization", function()
 		func("SX", "1")
 		assert.spy(minetest.chat_send_player).was.called(1)
 
+		spy.on(minetest, "chat_send_player")
+		func("SX", "5")
+		assert.spy(minetest.chat_send_player).was.called(1)
+
 		spy.on(minetest, "chat_send_player")
 		func("SX", "not valid number")
 		assert.spy(minetest.chat_send_player).was.called(1)
@@ -51,25 +65,74 @@ describe("Queue initialization", function()
 		func("SX", "1")
 		assert.spy(minetest.chat_send_player).was.called(1)
 
+		spy.on(minetest, "chat_send_player")
+		func("SX", "5")
+		assert.spy(minetest.chat_send_player).was.called(1)
+
 		spy.on(minetest, "chat_send_player")
 		func("SX", "not valid number")
 		assert.spy(minetest.chat_send_player).was.called(1)
 	end)
 
-	it("executes qos:clear", function()
-		local func = minetest.registered_chatcommands["qos:clear"].func
-
-		spy.on(minetest, "chat_send_player")
-		func("SX")
-		assert.spy(minetest.chat_send_player).was.called(3)
+	describe("qos:clear", function()
 
-		spy.on(minetest, "chat_send_player")
-		func("SX", "1")
-		assert.spy(minetest.chat_send_player).was.called(1)
+		local func = minetest.registered_chatcommands["qos:clear"].func
+		local function spy_on_queues_clear()
+			spy.on(QoS.data.queues[1], "clear")
+			spy.on(QoS.data.queues[2], "clear")
+			spy.on(QoS.data.queues[3], "clear")
+		end
+
+		it("clears all queues", function()
+			spy.on(minetest, "chat_send_player")
+			spy_on_queues_clear()
+			func("SX", "all")
+			assert.spy(minetest.chat_send_player).was.called(3)
+			assert.spy(QoS.data.queues[1].clear).was.called(1)
+			assert.spy(QoS.data.queues[2].clear).was.called(1)
+			assert.spy(QoS.data.queues[3].clear).was.called(1)
+		end)
+
+		it("clears selected queue", function()
+			spy.on(minetest, "chat_send_player")
+			spy_on_queues_clear()
+			func("SX", "1")
+			assert.spy(minetest.chat_send_player).was.called(1)
+			assert.spy(QoS.data.queues[1].clear).was.called(1)
+			assert.spy(QoS.data.queues[2].clear).was.called(0)
+			assert.spy(QoS.data.queues[3].clear).was.called(0)
+		end)
+
+		it("does not attempt clearing nonexistent queue", function()
+			spy.on(minetest, "chat_send_player")
+			spy_on_queues_clear()
+			func("SX", "5")
+			assert.spy(minetest.chat_send_player).was.called(1)
+			assert.spy(QoS.data.queues[1].clear).was.called(0)
+			assert.spy(QoS.data.queues[2].clear).was.called(0)
+			assert.spy(QoS.data.queues[3].clear).was.called(0)
+		end)
+
+		it("does not clear with invalid arguments", function()
+			spy.on(minetest, "chat_send_player")
+			spy_on_queues_clear()
+			func("SX", "not valid number")
+			assert.spy(minetest.chat_send_player).was.called(1)
+			assert.spy(QoS.data.queues[1].clear).was.called(0)
+			assert.spy(QoS.data.queues[2].clear).was.called(0)
+			assert.spy(QoS.data.queues[3].clear).was.called(0)
+		end)
+
+		it("does not clear with empty arguments", function()
+			spy.on(minetest, "chat_send_player")
+			spy_on_queues_clear()
+			func("SX")
+			assert.spy(minetest.chat_send_player).was.called(1)
+			assert.spy(QoS.data.queues[1].clear).was.called(0)
+			assert.spy(QoS.data.queues[2].clear).was.called(0)
+			assert.spy(QoS.data.queues[3].clear).was.called(0)
+		end)
 
-		spy.on(minetest, "chat_send_player")
-		func("SX", "not valid number")
-		assert.spy(minetest.chat_send_player).was.called(1)
 	end)
 
 end)
diff --git a/spec/init_spec.lua b/spec/init_spec.lua
index cfde6dd..af83a5c 100644
--- a/spec/init_spec.lua
+++ b/spec/init_spec.lua
@@ -8,4 +8,13 @@ describe("Mod initialization", function()
 		sourcefile("init")
 	end)
 
+	it("Wont crash if initialized with nil", function()
+		QoS(nil)
+		QoS()
+	end)
+
+	it("Wont crash if initialized with nil and priority", function()
+		QoS(nil, 2)
+	end)
+
 end)