Prasad,

On 09/21/2010 10:28 AM, Eitan Marder-Eppstein wrote:
>
>     4. My tf_monitor gives me the output as below
>     Node: /amcl 10.0502 Hz, Average Delay: -0.0153442 Max Delay:
>     0.145252 <==
>     which is in negative
>     Node: /eskorta_odom 22.022 Hz, Average Delay: 0.000921226 Max Delay:
>     0.0214084
>     Node: /eskorta_state 30.0514 Hz, Average Delay: 0.0180185 Max Delay:
>     0.0565425
>     Is it fine to have negative delay? -  i am not able to figure it
>     out since
>     this is my pre-hardware testing.
>
>
> I'm not sure why the average delay would be negative. I'll let someone 
> who knows more chime in on this.

I have added to the tf FAQ the answer to this question at 
http://www.ros.org/wiki/tf/FAQ#Why_do_I_see_negative_average_delay_in_tf_monitor.3F

Tully