[stunnel-users] stunnel 5.18 may keep high CPU usage

Michal Trojnara Michal.Trojnara at mirt.net
Sun Jun 14 06:59:52 CEST 2015


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On 14.06.2015 00:04, Dod wrote:
> I  use  sTunnel for POP-SSL and SMTP-SSL for 12 accounts (gmail,
> yahoo ...)  but  I noticed that after a few connexions sTunnel may
> keep high CPU, 25% as reported by TaskManager (50% on core 1 and 3
> on my Core-i5 quad-core).

After 1 minute of running stunnel running in server mode starts
computing new DH parameters.  This usually takes a few minutes
depending on your hardware.  The process is repeated every 24 hours.

If you don't want it, you can generate static DH parameters with:
    openssl dhparam 2048
and append them to your stunnel.conf

> Sometime the 25% CPU usage disappear by its own, sometime it can
> stay forever.

...depending on how you define "forever"...

> Never noticed such problem on previous versions.
> 
> Standard logs show nothing special.

You should see "DH parameters updated" message when the process completes.

Mike
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