When I was playing around with the Raspberry PI, one of the things I noticed that was the networking seemed to behave rather strangely at times - not bad enough that you could really say it was broken, but enough to reduce your level of confidence. Since I have previously used that SMSC USB<->Ethernet bridge chip with no problems, I suspect it's associated with the USB drivers on the PI.
Regards, Pete On Tue, Oct 30, 2012 at 7:34 AM, Shaun Kelly <[email protected]> wrote: > On 10/29/12 19:17 , Sarah White wrote: >> >> 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. > > [snips] > >>> 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. > > > I have a Raspberry Pi in the pool now (ntp.impsec.net), though I've set > bandwidth low (512k) so I am not seeing a great deal of load: > > root@ntp2:/home/pi# uptime > 19:19:57 up 9 days, 21:54, 1 user, load average: 0.03, 0.08, 0.15 > > > top - 19:20:10 up 9 days, 21:54, 1 user, load average: 0.03, 0.08, 0.15 > Tasks: 55 total, 1 running, 54 sleeping, 0 stopped, 0 zombie > %Cpu(s): 0.3 us, 0.2 sy, 0.0 ni, 93.9 id, 5.4 wa, 0.0 hi, 0.2 si, 0.0 > st > KiB Mem: 220652 total, 205332 used, 15320 free, 35256 buffers > KiB Swap: 102396 total, 880 used, 101516 free, 145376 cached > > Watching with tcpdump I am seeing only a few packets per second average, > withg some periods of burstiness where I see maybe 30 packets per second > where it will maybe get up to 10-15% busy. > > [more snips] > >>> >>> Let's assume a raspi can handle 200 packets per second without loosing >>> performance too badly (limited by cpu load, etc.) > > I'd think that's probably close based on what I'm seeing, though again I'm > just eyeballing tcpdump. Mind you, I'm not using the supported turbo modes > so there might be some wiggle room with mild overclocking. > > > -Shaun > (sig pending) > > _______________________________________________ > 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. _______________________________________________ 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.
