Date: Wed, 9 Nov 2011 23:12:35 +1100 From: Julien Ridoux <jrid@cubinlab.ee.unimelb.edu.au> To: freebsd-current@freebsd.org Subject: [RFC] Feed-Forward Clock support Message-ID: <5C5F698C-FA28-4423-BD7B-CCD456752ACA@cubinlab.ee.unimelb.edu.au>
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Hi all, I have written a set of patches to support feed-forward clock = synchronisation algorithms. To cut a long story short, this work = provides support for alternatives to the NTP daemon. The RADclock daemon = we developed is one of these alternatives. This work is supported by the FreeBSD Foundation and a short project = description can be found here: http://www.freebsdfoundation.org/press/2011Aug-newsletter.shtml#Project4 The patches will be committed on the weekend of Nov 19th and suggestions = and comments would be very appreciated. The patches against r227382 can be found at this URL: http://www.cubinlab.ee.unimelb.edu.au/~jrid/ffclock_fbsd_r227382.tar.gz The patches introduce 3 new system calls and it is then necessary to run = 'make sysent' in sys/kern and sys/compat/freebsd32. The feed-forward support can be compiled by adding the FFCLOCK option to = the kernel configuration file. For more information, a fairly high level description of the = feed-forward approach for clock synchronisation is given in this ACM = Queue article. http://queue.acm.org/detail.cfm?id=3D1773943 All relevant technical papers, the latest stable RADclock version and = more can be found here: http://www.synclab.org/radclock/ Please let me know your thoughts, Thanks, Julien
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