[erlang-questions] Problematic SSL message publication

Ryan Brown ryankbrown@REDACTED
Wed Sep 25 14:18:20 CEST 2013

Hi Ingela,

Thank you for the response. I suppose I don't really know how to see what
messages are in the ssl queue. What I am looking at is nregs and watching
the "msgs" column growing at a steady pace. Is there a way to look at these

As for reproducing in the latest version of ssl. I was planning on
upgrading a machine to 16 today and attempting to reproduce. This should
get me the latest ssl version correct?

Best regards,

Ryan Brown

On Wed, Sep 25, 2013 at 2:09 AM, Ingela Andin <ingela.andin@REDACTED>wrote:

> Hi!
> 2013/9/24 Ryan Brown <ryankbrown@REDACTED>
>> We have a fairly high-volume (28m+ messages/day) application that works,
>> essentially, as a pub-sub for many internal and external applications. We
>> are experiencing an issue under load where and subscribers that are using
>> ssl are experiencing a significant slowness in delivery. When we restart
>> the server we begin watching the processes in our application and we can,
>> very reliably and fairly quickly, see the ssl_manager_sup process message
>> queue start increasing in size. As this happens, all messages for those
>> subscribers with ssl endpoints begin to back-up and delivery slows to a
>> near halt.
> What messages are there in the queue?
> It appears that ssl is a bit of a known issue within erlang. Or, at least,
>> a tricky use-case to perfect. Are there any known issues that we can
>> address in terms of configuration, best practices in setting-up ssl
>> connections or anything else for that matter we can be doing to resolve
>> this issue or more clearly identify the root cause? We're in active
>> troubleshooting mode and doing what we can to dig deeper including
>> dissecting the code to the kernel.
>> We are running Erlang 15B02 (64bit).
> So that would be ssl-5.1?  Is it possible to reproduce the problem on the
> latest version ?
> Regards Ingela Erlang/OTP team - Ericsson AB

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