Re: [ntp:questions] 1Gb/s network issues - was: Re: OT: GPS18x LVC failure

2009-10-13 Thread David J Taylor
Kasper Pedersen wrote in message news:4ad360ef$0$36567$edfad...@dtext01.news.tele.dk... [] I built a device that spits out priority tagged ethernet frames with 200ns error to UTC, and did a number of tests with different networks and nics, the result of which is in a table here:

Re: [ntp:questions] 1Gb/s network issues - was: Re: OT: GPS18x LVC failure

2009-10-13 Thread Rob
David J Taylor david-tay...@blueyonder.not-this-part.nor-this.co.uk.invalid wrote: Unruh unruh-s...@physics.ubc.ca wrote in message news:qsbam.47742$db2.29...@edtnps83... [] Actually those Gb ethernet switches seems to have some really bad and variable latencies. My system, before they

[ntp:questions] 1Gb/s network issues - was: Re: OT: GPS18x LVC failure

2009-10-12 Thread David J Taylor
Unruh unruh-s...@physics.ubc.ca wrote in message news:qsbam.47742$db2.29...@edtnps83... [] Actually those Gb ethernet switches seems to have some really bad and variable latencies. My system, before they installed Gb switches, had a consistant roundtrip of 140 usec and gave better than

Re: [ntp:questions] 1Gb/s network issues - was: Re: OT: GPS18x LVC failure

2009-10-12 Thread Unruh
David J Taylor david-tay...@blueyonder.not-this-part.nor-this.co.uk.invalid writes: Unruh unruh-s...@physics.ubc.ca wrote in message news:qsbam.47742$db2.29...@edtnps83... [] Actually those Gb ethernet switches seems to have some really bad and variable latencies. My system, before they

Re: [ntp:questions] 1Gb/s network issues - was: Re: OT: GPS18x LVC failure

2009-10-12 Thread David J Taylor
Unruh unruh-s...@physics.ubc.ca wrote in message news:fhjam.47784$db2.22...@edtnps83... [] Most interesting, Bill. Mine is a relatively cheap and cheerful device from Netgear (GS608): http://www.netgear.co.uk/ethernet_network_switch_gs605.php so whether being very simple and unmanaged is

Re: [ntp:questions] 1Gb/s network issues - was: Re: OT: GPS18x LVC failure

2009-10-12 Thread Unruh
David J Taylor david-tay...@blueyonder.not-this-part.nor-this.co.uk.invalid writes: Unruh unruh-s...@physics.ubc.ca wrote in message news:fhjam.47784$db2.22...@edtnps83... [] Most interesting, Bill. Mine is a relatively cheap and cheerful device from Netgear (GS608):