Date: Mon, 1 Apr 1996 21:15:40 +1000 From: Bruce Evans <bde@zeta.org.au> To: freebsd-current@freefall.freebsd.org, kuku@gilberto.physik.rwth-aachen.de Subject: Re: calcru: negative time: Message-ID: <199604011115.VAA15805@godzilla.zeta.org.au>
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>[deleted] >calcru: negative time: -11929 usec >calcru: negative time: -3909 usec >calcru: negative time: -3842 usec >calcru: negative time: -17709 usec >calcru: negative time: -3480 usec This is caused by hardclock() interrupt latency. The problem is especially noticable on i586's and i686's because any latency causes the clock to go backwards; on i386's and i486's, the latency must be > 1 clock tick (10000 usec) to cause problems. Normally the latency on i586's is > 0 but < 10 usec and isn't detectable. There must be bugs elsewhere to cause latencies of more than a few tens of usecs. Bruce
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