Date: Fri, 03 Nov 2000 12:36:24 -0700 From: Warner Losh <imp@village.org> To: Alfred Perlstein <bright@wintelcom.net> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: granularity of gettimeofday() Message-ID: <200011031936.MAA19515@harmony.village.org> In-Reply-To: Your message of "Fri, 03 Nov 2000 10:17:25 PST." <20001103101725.K20567@fw.wintelcom.net> References: <20001103101725.K20567@fw.wintelcom.net> <920.973271386@critter> <Pine.SOL.4.21.0011031255360.118-100000@jade>
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In message <20001103101725.K20567@fw.wintelcom.net> Alfred Perlstein writes: : Gettimeofday will force a check of the system hardware, basically : you should get better than 100HZ resolution with gettimeofday. gettimeofday on many systems do this. There are other, older systems that do not have a high resolution clock to read and rely on timer interrupts to update the clock. These systems limit their gettimeofday reports to 10ms + a "uniqifier" that means two calls to gettimeofday in a row don't get the same value. On FreeBSD, we go ahead and read the timer hardware so you aren't limited to 1/HZ increments. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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