diff --git a/tuned/plugins/plugin_scheduler.py b/tuned/plugins/plugin_scheduler.py
index 4ccd059..53a74d0 100644
--- a/tuned/plugins/plugin_scheduler.py
+++ b/tuned/plugins/plugin_scheduler.py
@@ -580,9 +580,10 @@ class SchedulerPlugin(base.Plugin):
 			except KeyError:
 				continue
 			_affinity = self._get_intersect_affinity(prev_affinity, affinity, affinity)
-			affinity_hex = self._cmd.cpulist2hex(_affinity)
-			self._set_irq_affinity(irq, affinity_hex)
-			irq_original.irqs[irq] = prev_affinity
+			if set(_affinity) != set(prev_affinity):
+				affinity_hex = self._cmd.cpulist2hex(_affinity)
+				self._set_irq_affinity(irq, affinity_hex)
+				irq_original.irqs[irq] = prev_affinity
 
 		# default affinity
 		prev_affinity_hex = self._cmd.read_file("/proc/irq/default_smp_affinity")