On 2013-06-12 19:53, William Kwan wrote:

I would like to find out if there’s anyway to tune stunnel or what’s the best practice you would recommend.

I have a bit more than 100 sessions defined in stunnel.conf. It appears that clients started to see latency increase.

I'm pretty sure latency increase has nothing to do with the number of service sections in your stunnel.conf.

You should investigate:
- The number of concurrent sessions (with netstat);
- The number of new sessions negotiated per second (from stunnel logs);
- Network bandwidth utilization (with your favorite network monitoring tool), and
- Your platform (some operating systems are weak server platforms).

Feel free to share your stunnel.conf. I may have some performance hints for you.

BTW: Are you sure that stunnel is the bottleneck here and not the application server?

Best regards,
Michal Trojnara