--- irqbalance.orig	2012-02-23 09:01:12.334264440 +0200
+++ irqbalance.orig	2012-02-23 09:00:51.313265878 +0200
@@ -12,7 +12,16 @@ 
 	start-stop-daemon --exec /usr/sbin/irqbalance "$@"
 }
 
+check_sysfs() {
+	if grep -q MSI /proc/interrupts 2>/dev/null && [[ -z "$(find /sys/devices -type d -name msi_irqs 2>/dev/null)" ]]; then
+		eerror "MSI interrupts found in /proc/interrupts but none found in sysfs."
+		eerror "You need to update your kernel."
+		return 1
+	fi
+}
+
 start() {
+	check_sysfs || return 1
 	ebegin "Starting irqbalance"
 	ssd --start -- ${IRQBALANCE_OPTS}
 	eend $?