Date: Wed, 11 Jul 2012 12:42:23 +0300 From: Alexander Motin <mav@FreeBSD.org> To: Harti Brandt <hartmut.brandt@dlr.de> Cc: davide@FreeBSD.org, freebsd-hackers@freebsd.org, Paul Albrecht <albrecht@glccom.com> Subject: Re: kqueue timer timeout period Message-ID: <4FFD4A7F.9060103@FreeBSD.org>
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Hi. Historically FreeBSD used completely different hardware time sources for time keeping and time events. Not sure about 5%, but the last could be less precise in some cases. FreeBSD 9.0, depending on hardware, can be more precise because of using same time source in both cases. Also there is ongoing GSoC project now by Davide Italiano to handle sub-HZ resolution for time events. Present tests show reaching 20 microseconds precision; and I think it can be improved further. -- Alexander Motin
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