From a114208c341bc5a712d49fcc016cf27f4651f212 Mon Sep 17 00:00:00 2001
From: jhb <jhb@FreeBSD.org>
Date: Thu, 17 Jan 2008 18:59:38 +0000
Subject: Use cpu_spinwait() (i.e., "pause") when spinning on rdtsc during
 DELAY().

MFC after:	1 week
---
 sys/isa/atrtc.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'sys/isa')

diff --git a/sys/isa/atrtc.c b/sys/isa/atrtc.c
index a67db31..f31c7ea 100644
--- a/sys/isa/atrtc.c
+++ b/sys/isa/atrtc.c
@@ -291,6 +291,7 @@ DELAY(int n)
 		start = rdtsc();
 		end = start + (tsc_freq * n) / 1000000;
 		do {
+			cpu_spinwait();
 			now = rdtsc();
 		} while (now < end || (now > start && end < start));
 		sched_unpin();
-- 
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