Folks,
I've recently been testing NTP 4.2.7p241 on a variety of Windows systems
with almost uniformly excellent results. For me, it's the best version of
NTP to date - thanks Dave Hart! However, it has now revealed a couple of
issues which may be fundamental to NTP, or may be artefacts of
I wrote:
An upcoming experiment at Fermilab will observe neutrinos at both ends
(the far end will be in Minnesota).
unruh writes:
Well, no. At best the electrons or muons at one end.
At best the electrical pulse produced by a photomultiplier when struck
by a photon generated when a muon or
On 2011-12-24, David J Taylor david-tay...@blueyonder.co.uk wrote:
I suppose the answer to how the spikes arise could be simply that's
how Wi-Fi is, with transmission uncertainties and the possibility of
interference. I had expected a greater variation to the offset with
Wi-Fi, but not the
On 2011-12-24, David J Taylor wrote:
I suppose the answer to how the spikes arise could be simply that's
how Wi-Fi is, with transmission uncertainties and the possibility of
interference. I had expected a greater variation to the offset with
Wi-Fi, but not the spikes. Perhaps NTP is sensitive
On 2011-12-24, David J Taylor david-tay...@blueyonder.co.uk.invalid wrote:
Folks,
I've recently been testing NTP 4.2.7p241 on a variety of Windows systems
with almost uniformly excellent results. For me, it's the best version of
NTP to date - thanks Dave Hart! However, it has now revealed
On 2011-12-24, John Hasler jhas...@newsguy.com wrote:
I wrote:
An upcoming experiment at Fermilab will observe neutrinos at both ends
(the far end will be in Minnesota).
unruh writes:
Well, no. At best the electrons or muons at one end.
At best the electrical pulse produced by a
unruh writes:
They require ns accuracy in the timing and m accuracy in the
distance. And the timing is not simply gps ( although they could have
gotten that wrong) but then that timing has to be brought down into
the mine a km or so below ground and horizontally and that also has to
be
John Hasler jhas...@newsguy.com wrote:
unruh writes:
They require ns accuracy in the timing and m accuracy in the
distance. And the timing is not simply gps ( although they could have
gotten that wrong) but then that timing has to be brought down into
the mine a km or so below ground and
On 2011-12-24, j...@specsol.spam.sux.com j...@specsol.spam.sux.com wrote:
John Hasler jhas...@newsguy.com wrote:
unruh writes:
They require ns accuracy in the timing and m accuracy in the
distance. And the timing is not simply gps ( although they could have
gotten that wrong) but then that
On 2011-12-24, John Hasler jhas...@newsguy.com wrote:
unruh writes:
They require ns accuracy in the timing and m accuracy in the
distance. And the timing is not simply gps ( although they could have
gotten that wrong) but then that timing has to be brought down into
the mine a km or so below
unruh un...@invalid.ca wrote:
On 2011-12-24, j...@specsol.spam.sux.com j...@specsol.spam.sux.com wrote:
John Hasler jhas...@newsguy.com wrote:
unruh writes:
They require ns accuracy in the timing and m accuracy in the
distance. And the timing is not simply gps ( although they could have
unruh writes:
Surveying is done by GPS, as is timing so mountain ranges do not
really matter.
The OPERA team had to survey a traverse through the Gran Sasso highway
tunnel to get to suitable benchmarks. You're right though: they did not
survey the entire distance.
--
John Hasler
Jim Pennino writes:
The issue is that most people don't seem to be able to understand how
to get an accurate position of a location that is vertically under a
km or so of dirt, yet horizontally feet from wide open sky and GPS
signals.
The open sky nearest the OPERA detector is straight up
John Hasler jhas...@newsguy.com wrote:
Jim Pennino writes:
The issue is that most people don't seem to be able to understand how
to get an accurate position of a location that is vertically under a
km or so of dirt, yet horizontally feet from wide open sky and GPS
signals.
The open sky
The open sky nearest the OPERA detector is straight up through 1400m of
rock.
Jim Pennino writes:
And the easiest open sky to get to is horizontally down the tunnel to
the entrance which is next to a freeway.
Yes, the entrance is next to a freeway. The entrance to the LNGS
facility where
On Sat, Dec 24, 2011 at 18:18, unruh un...@invalid.ca wrote:
On 2011-12-24, David J Taylor david-tay...@blueyonder.co.uk.invalid wrote:
- one Netbook PC worked very well on a LAN connection (about 1 ms steady
jitter). However, when moving to a Wi-Fi connection after a power-down
reboot, the
John Hasler jhas...@newsguy.com wrote:
The open sky nearest the OPERA detector is straight up through 1400m of
rock.
Jim Pennino writes:
And the easiest open sky to get to is horizontally down the tunnel to
the entrance which is next to a freeway.
Yes, the entrance is next to a freeway.
unruh un...@invalid.ca wrote:
On 2011-12-24, j...@specsol.spam.sux.com j...@specsol.spam.sux.com wrote:
unruh un...@invalid.ca wrote:
On 2011-12-24, j...@specsol.spam.sux.com j...@specsol.spam.sux.com wrote:
John Hasler jhas...@newsguy.com wrote:
unruh writes:
They require ns accuracy in the
On 2011-12-25, j...@specsol.spam.sux.com j...@specsol.spam.sux.com wrote:
John Hasler jhas...@newsguy.com wrote:
The open sky nearest the OPERA detector is straight up through 1400m of
rock.
Jim Pennino writes:
And the easiest open sky to get to is horizontally down the tunnel to
the
unruh un...@invalid.ca wrote:
On 2011-12-25, j...@specsol.spam.sux.com j...@specsol.spam.sux.com wrote:
John Hasler jhas...@newsguy.com wrote:
The open sky nearest the OPERA detector is straight up through 1400m of
rock.
Jim Pennino writes:
And the easiest open sky to get to is
Redwood City, CA - 2011/12/24 - The NTP Public Services Project
(http://support.ntp.org/) is pleased to announce that NTP 4.2.6p5,
a Point Release of the NTP Reference Implementation from the
NTP Project, is now available at http://www.ntp.org/downloads.html and
http://support.ntp.org/download.
unruh un...@invalid.ca wrote in message
news:KHoJq.2272$zj4.1...@newsfe03.iad...
[]
Question: would you expect the reported jitter to increase over the
first 30 minutes or so?
Could be somone switched on a vacuum cleaner for example.
No. I've seen something like this behaviour before,
Dave Hart wrote in message news:CAMbSiYD0cY27Ft9cadBzV4ravKcz-
[]
Retransmission is the killer issue for NTP performance over 802.11.
For practical interop with software developed on wired networks, WiFi
equipment detects packet loss and triggers retransmission invisibly to
higher layers. I
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