CircuitBuildTimeout Management and the Pareto Distribution

Cav cav at
Mon Jul 26 22:33:22 UTC 2010

Thanks Mike !

With kind regards,
Cav Edwards

Mike Perry wrote:
> Thus spake Cav (cav at
>> Hi Mike,
>> Thanks for a quick reply. Maybe its my warped mind that had me consider 
>> that the management of timeouts (sliding the timeout up and down - as it 
>> appears in the logs) would affect the distribution of timeouts and 
>> therefore the pareto distribution around them.
>> I will admit to experimenting with smaller values of 
>> CBT_DEFAULT_QUANTILE_CUTOFF. These lead to 'peaks' in the timeout 
>> distribution. The smaller the value, the tighter these 'peaks' seem to be.
> This should not be the case in and above. Changing the
> QUANTILE_CUTOFF default should now only govern which circuits you
> actually use. Circuits should continue to build until
> CBT_DEFAULT_CLOSE_QUANTILE, so the distribution of recorded buildtimes
> will be much more insenitive to changes in the timeout value.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the tor-dev mailing list