[ntp:questions] Test ntpd performance

R C rc_work at yahoo.com
Sun Sep 26 00:05:34 UTC 2010

Hi all,

Thanks for your prompt response.

My main intension of this scalability testing is to find out 

1. how long it takes for the ntpd server to serve 100,000 clients. 
2. What is the rate at which the server can process client requets.

So, to test the above, I want to be able to simulate a 100,000 clients so i can 
hit my ntpd server with these 100,000 client requests. Please let me know if you 
have more questions.


From: Chuck Swiger <cswiger at mac.com>
To: R C <rc_work at yahoo.com>
Cc: questions at lists.ntp.org
Sent: Sat, September 25, 2010 8:55:36 AM
Subject: Re: [ntp:questions] Test ntpd performance

On Sep 24, 2010, at 11:23 AM, R C wrote:
> I want to test the performance of the ntpd server. Are there any free/open 
> source ntp clients that measure the server scalability? Thanks in advance for 
> your help.

The ntpd sources come with ntpdate; use "ntpdate -q" in a shell script loop to 
issue many queries without changing the clock.  Anyway, even on old 
Pentium-grade hardware and 100Mbs ethernet, you should be able to do thousands 
to tens of thousands of NTP packets per second.  The bottleneck almost 
invariably will your upstream network connection, either in terms of bandwidth 
or in terms of a firewall/NAT box trying to keep state.



More information about the questions mailing list