svn commit: r299065 - head/sys/dev/xen/timer

[Roger Pau Monné]

Author: royger
Date: Wed May  4 13:49:59 2016
New Revision: 299065
URL: https://svnweb.freebsd.org/changeset/base/299065

Log:
  xen/pvclock: set the correct resolution for the Xen PV clock
  
  The Xen PV clock has a resolution of 1ns, so set the resolution to the
  highest one that FreeBSD supports, which is 1us.
  
  MFC after:	2 weeks
  Sponsored by:	Citrix Systems R&D

Modified:
  head/sys/dev/xen/timer/timer.c

Modified: head/sys/dev/xen/timer/timer.c
==============================================================================
--- head/sys/dev/xen/timer/timer.c	Wed May  4 13:48:59 2016	(r299064)
+++ head/sys/dev/xen/timer/timer.c	Wed May  4 13:49:59 2016	(r299065)
@@ -77,7 +77,12 @@ static devclass_t xentimer_devclass;
 
 /* Xen timers may fire up to 100us off */
 #define	XENTIMER_MIN_PERIOD_IN_NSEC	100*NSEC_IN_USEC
-#define	XENCLOCK_RESOLUTION		1000001 /* ATRTC resolution + 1 */
+
+/*
+ * The real resolution of the PV clock is 1ns, but the highest
+ * resolution that FreeBSD supports is 1us, so just use that.
+ */
+#define	XENCLOCK_RESOLUTION		1
 
 #define	XENTIMER_QUALITY	950