Date: Sun, 2 Jan 2000 16:38:02 -0600 From: Karl Denninger <karl@Denninger.Net> To: Warner Losh <imp@village.org> Cc: current@FreeBSD.ORG Subject: Re: xntpd - VERY old folks, how about updating? :-) Message-ID: <20000102163802.A25936@Denninger.Net> In-Reply-To: <200001022232.PAA31807@harmony.village.org>; from Warner Losh on Sun, Jan 02, 2000 at 03:32:00PM -0700 References: <20000102161029.A25883@Denninger.Net> <20000102103732.A23004@Denninger.Net> <20000102094459.B22738@Denninger.Net> <8426.946828544@critter.freebsd.dk> <20000102103732.A23004@Denninger.Net> <200001022133.OAA31402@harmony.village.org> <20000102161029.A25883@Denninger.Net> <200001022232.PAA31807@harmony.village.org>
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On Sun, Jan 02, 2000 at 03:32:00PM -0700, Warner Losh wrote: > In message <20000102161029.A25883@Denninger.Net> Karl Denninger writes: > : Why spend twice what Mr. Schwartz seems to want to charge? > > Because we need a PPS that is < 10nS from the true start of second for > our application? 1uS is really really bad for the timing geeks in the > audience. > > Warner And on what hardware do you think you can obtain 10ns resolution RELIABLY at the software level in the Unix environment and under FreeBSD? Answer: NONE! The actual usable resolution of a timing source is determined by the maximum slop in ANY part of the complete system. I challenge you to get actual REPEATABLE 10ns results while a multi-tasking anything is running on the recipient of that data. - -- Karl Denninger (karl@denninger.net) Web: http://childrens-justice.org Isn't it time we started putting KIDS first? See the above URL for a plan to do exactly that! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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