Date: Mon, 2 Jul 2007 19:01:24 GMT From: John Baldwin <jhb@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 122735 for review Message-ID: <200707021901.l62J1OrU085496@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=122735 Change 122735 by jhb@jhb_mutex on 2007/07/02 19:01:02 'pause' in between reads of the TSC while spinning in DELAY(). Affected files ... .. //depot/projects/smpng/sys/amd64/isa/clock.c#22 edit .. //depot/projects/smpng/sys/i386/isa/clock.c#54 edit Differences ... ==== //depot/projects/smpng/sys/amd64/isa/clock.c#22 (text+ko) ==== @@ -283,6 +283,7 @@ start = rdtsc(); end = start + (tsc_freq * n) / 1000000; do { + cpu_spinwait(); now = rdtsc(); } while (now < end || (now > start && end < start)); sched_unpin(); ==== //depot/projects/smpng/sys/i386/isa/clock.c#54 (text+ko) ==== @@ -288,6 +288,7 @@ 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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