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than RDTSC registers from Pentium. After a reminder by Garrett Wollman <wollman@FreeBSD.org> [1] that FreeBSD has a gethrtime() similar function, added experimental support for FreeBSD clock_gettime(2) which should work in all FreeBSD supported ARCHes o Add notes in both DESCR and PKGMESSAGE that there might be precision differences since this is experimental code Reviewed by: portmgr (silence/no objections) Submitted by: wollman [1]
21 lines
951 B
Text
21 lines
951 B
Text
clockspeed uses a hardware tick counter to compensate for a persistently
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fast or slow system clock. Given a few time measurements from a reliable
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source, it computes and then eliminates the clock skew.
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sntpclock checks another system's NTP clock, and prints the results in a
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format suitable for input to clockspeed. sntpclock is the simplest
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available NTP/SNTP client.
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taiclock and taiclockd form an even simpler alternative to SNTP. They
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are suitable for precise time synchronization over a local area network,
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without the hassles and potential security problems of an NTP server.
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This version of clockspeed can use the Pentium RDTSC tick counter or the
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Solaris gethrtime() nanosecond counter.
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A port to non-i386 platforms was done using the clock_gettime(2)
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function. Since this is somewhat experimental, there might be some
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tiny precision differences from the i386 platform versions. You
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have been warned!
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WWW: http://cr.yp.to/clockspeed.html
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