Date: Sun, 02 Jan 2000 23:50:09 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Karl Denninger <karl@Denninger.Net> Cc: Warner Losh <imp@village.org>, current@FreeBSD.ORG Subject: Re: xntpd - VERY old folks, how about updating? :-) Message-ID: <898.946853409@critter.freebsd.dk> In-Reply-To: Your message of "Sun, 02 Jan 2000 16:38:02 CST." <20000102163802.A25936@Denninger.Net>
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In message <20000102163802.A25936@Denninger.Net>, Karl Denninger writes: >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. What rides on this challenge ? What is the prize ? I would use some cash, and this will be like picking cherries... -- Poul-Henning Kamp FreeBSD coreteam member phk@FreeBSD.ORG "Real hackers run -current on their laptop." FreeBSD -- It will take a long time before progress goes too far! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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