[Bro] Custom event handler script generates heavy CPU load with Bro 2.5.5 (PF_RING)

[Elena Bykovchenko]

Hello. I have a script which defines a custom handler on mime_data event:

event mime_all_data (c: connection, length: count, data: string)
{
 // do stuff
}

When this script is ran with capturing traffic in PF_RING mode using lb_procs=2, Bro processes consume 100% of both pinned CPU cores. This is not the case when capturing without PF_RING in single process mode though. What are possible reasons for this? Can it be optimized on the script side? What can be done to lower the CPU usage?
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