Date: Mon, 26 Oct 1998 11:11:22 +1030 From: Greg Lehey <grog@lemis.com> To: Shafia Kausar <s0k9955@unix.tamu.edu>, FreeBSD Questions <freebsd-questions@FreeBSD.ORG> Subject: Re: Timer granularity Message-ID: <19981026111122.B16609@freebie.lemis.com> In-Reply-To: <Pine.SOL.3.96.981025112610.1374E-100000@fox.tamu.edu>; from Shafia Kausar on Sun, Oct 25, 1998 at 11:47:45AM -0600 References: <Pine.SOL.3.96.981025112610.1374E-100000@fox.tamu.edu>
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On Sunday, 25 October 1998 at 11:47:45 -0600, Shafia Kausar wrote:
> Hi All,
> I have just started using FreeBSD. I am looking out for the kernel timer
> resolution. Any info or pointers are welcome.
Take a look at /sys/kern/kern_clock.c. To quote the comment at line
502 of the 3.0-RELEASE version,
/*
* We have four functions for looking at the clock, two for microseconds
* and two for nanoseconds. For each there is fast but less precise
* version "get{nano|micro}time" which will return a time which is up
* to 1/HZ previous to the call, whereas the raw version "{nano|micro}time"
* will return a timestamp which is as precise as possible.
*/
> P.S: I am sorry if this is a FAQ. Please give me the pointer if it
> is one.
It's definitely not a FAQ, but if you're messing around in the kernel,
you might consider joining the FreeBSD-hackers mailing list, which is
more in keeping with this kind of question.
Greg
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