[ntp:questions] mtp srver load figures?

Unruh unruh-spam at physics.ubc.ca
Sat Nov 21 18:04:30 UTC 2009

Kasper Pedersen <spam at kasperkp.dk> writes:

>On 11/20/2009 08:36 AM, Hal Murray wrote:
>> Don't calculate, measure.
>> I just measured over 5000 packets per second on a 1 GHz Via.

>More measurements:

>15000 pps on a 1.6GHz Atom N270, ntpd pegged at 99% (one thread)
>Much less than I expected. It'll only push 10Mbps of ntp packets.

>8500 pps with chrony from git, 88% cpu (one thread) on the same board.
>even worse.

>My GPSDO with embedded ntp server, 66MHz AVR32 cpu and custom network 
>stack (ntp is handled kernel-side) tops out at 9000 pps.
>Not bad, considering the clock is 1/24 of the atom.

I suspect it is all in the network stack, rather than in the ntp/chrony. Not sure
why chrony should be worse. 

>/Kasper Pedersen

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