Re: Host Time epoch
Re: Host Time epoch
- Subject: Re: Host Time epoch
- From: Herbie Robinson <email@hidden>
- Date: Thu, 10 Feb 2005 18:10:10 -0500
At 12:38 PM -0800 2/10/05, Steve Checkoway wrote:
On Feb 10, 2005, at 12:21 PM, John Iversen wrote:
Sorry, I'm not aware of this issue, but it's of interest to me, and
is rather fundamental. Would you mind elaborating? What is the
nature of the non-monotonicity--I can't imagine you mean actual
reversals in the host time, I hope. Instead, do you mean that the
rate of increase of the HostTime is variable, so it drifts away
from 'real time'? How large is the effect in your experience?
Oh no. I mean non-monotonicity. Time does indeed move backward. I
filed a bug report quite a while ago and I was told (eventually)
that it was fixed in some later version of the OS.
Was this on a dual processor system?
This is just a guess, but the clock is probably a hardware register
in the CPUs; therefore, it is probably per cpu. With most hardware,
it's nearly impossible to reset the clocks to zero simultaneously;
so, there will almost always be a slight offset between the clocks on
different CPUs.
--
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