🚀 go-pugleaf

In article <19950320.005908.47@comptech.demon.co.uk> Adam Goodfellow (adam@comptech.demon.co.uk) wrote:

> The Arc *hardware* clock is quite accurate. The software cloci - the ine
> that you read, is not. Once every hour or day (cant remember which) so I
> think, the RTCAdjust module kicks in to re-align the software clock with
> the hardware clock.
>
> Depending upon what time it is, you may find the software clock quite a
> long way out, though it will be OK again once you machine has been reset.

It can drift by an awfully large amount if you run a game that stops as
many interrupts as it can :-) I seem to recall that E-Type exhibits this
behaviour to a quite spectacular extent.

> Of course the accuracy that you perceive in the demon net clock is
> dependant upon the how it is read, and how well network delays are taken
> into account.
>
> I have never looked at the NTP code in !TCPIP, so I dont know how
> accurate it is...

I don't think it considers net delays at all, so with an RTT to one of
the Demon machines of between 250-1500ms it might be up to 1.5secs out
after you set it from the net.

Tom

--
Tom Hughes (tom@compton.demon.co.uk)
5 Lampits, Hoddesdon, Herts EN11 8EH
... I tell them there's no problems...Only Solutions...