re #13613 rb4516 Tunables needs volatile keyword

@@ -20,10 +20,13 @@
  */
 /*
  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
+/*
+ * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
+ */
 
 /*
  * SunOS MT STREAMS ERI(PCI) 10/100 Mb Ethernet Device Driver
  */
 

@@ -344,12 +347,12 @@
 
 /*
  * ERI ERX Interrupt Blanking Time
  * Each count is about 16 us (2048 clocks) for 66 MHz PCI.
  */
-static  int     intr_blank_time = 6;    /* for about 96 us */
-static  int     intr_blank_packets = 8; /*  */
+volatile int    intr_blank_time = 6;    /* for about 96 us */
+volatile int    intr_blank_packets = 8; /*  */
 
 /*
  * ERX PAUSE Threshold Register value
  * The following value is for an OFF Threshold of about 15.5 Kbytes
  * and an ON Threshold of 4K bytes.