On 10/29/2012 7:53 PM, Chris Albertson wrote: > I'm curious what load average numbers do you get if you type "uptime" > after running NTP for some hours. I'd guess that even on the Pi the > CPU is hardly used at all. That would also depend of the number of > NTP clients you are supporting. > > On Mon, Oct 29, 2012 at 12:19 PM, David J Taylor > <[email protected]> wrote: >> I've spent the last few days getting a very simple, low-power NTP server >> working on a Raspberry Pi. > Chris Albertson > Redondo Beach, California
Basically, I'm thinking this method (raspi + refclock) is a good way to feed a handfull of public stratum 2 servers which by definition don't have their own local refclock. If you made your raspi stratum 1 server publicly available via pool.ntp.org it would almost certainly be overloaded. ... Basically, I'm thinking I might do this myself once I get done replacing my low-quality NMEA only / firmware bug / navigation mode GPS refclock with the timing mode one I'm still working on putting together. (this is my first time setting up an antenna of any kind / had to do some research and make sure I ordered the right parts) http://www.endruntechnologies.com/time_server_clients.htm ^using the example from this: Let's assume a raspi can handle 200 packets per second without loosing performance too badly (limited by cpu load, etc.) Now let's assume that all clients using the raspi time server are NOT malfunctioning, and have settled down to the default maxpoll time of 1024 seconds between updates. Number of Clients = (Number of Packets per Second) multiplied by 1024 That would come out to a capacity of just over 200 thousand clients if the rate at which clients send packets were uniformly distributed ... Not sure if it's reasonable to expect a raspi to handle 200 connections per second without breaking a sweat. I've not talked with many people who tested them, so just a guess based on the example from endrun's website which states the cpu on their hardware runs at 133mhz so it might really be possible to handle 200 connections per second with the 700mhz raspi. hope this helps, Sarah White _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
