<p>I think this moment not well documented.</p>
<p>And also something wrong there.<br>
If I have timer_interval 60 with hash_size 5 then for registration with expires=120 we have<br>
rec->registration_timeout = now + 120 - 60 = now + 60<br>
So, we will update every 60 seconds. It's not good.</p>
<p>Maybe this logic will be better?<br>
rec->registration_timeout = now + 120 - 120*0.8 (80% of expires)</p>
<p>rec->registration_timeout = now + rec->expires - rec->expires*0.8;<br>
instead of<br>
rec->registration_timeout = now + rec->expires - timer_interval;</p>
<p>When you have many registrants and database with many different intervals, you will have many inaccuracies with re-register intervals.</p>
<p>Or we should better document this moment. For example, we should recommend using as small timer_interval as user can.</p>
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