Re: gettimeofday resolution seriously degraded in test9

[Stephen Hemminger]

Arghh... the patch was being way more agressive than necessary.  
tickadj which limits NTP is always 1 (for HZ=1000) so NTP will change
at most 1 us per clock tick.  This meant we only had to stop time
for the last us of the interval.


diff -Nru a/arch/i386/kernel/time.c b/arch/i386/kernel/time.c
--- a/arch/i386/kernel/time.c	Mon Oct 27 17:13:22 2003
+++ b/arch/i386/kernel/time.c	Mon Oct 27 17:13:22 2003
@@ -110,8 +110,9 @@
 		 * so make sure not to go into next possible interval.
 		 * Better to lose some accuracy than have time go backwards..
 		 */
-		if (unlikely(time_adjust < 0) && usec > tickadj)
-			usec = tickadj;
+		if (unlikely(time_adjust < 0) && 
+		    unlikely(usec > tick_usec - tickadj)) 
+			usec = tick_usec - tickadj;
 
 		sec = xtime.tv_sec;
 		usec += (xtime.tv_nsec / 1000);
-
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