The Edge SWG (ProxySG) may report the following in the event log:

2009-06-29 02:16:15-00:00UTC  "TCP acceptance regulation: memory pressure is on"  0 30204:1   ../main/event_logger.cpp:36

In addition, the Edge SWG (ProxySG) may report memory pressure percentage in the Management Console.

End-users may notice "slowness" when viewing web pages when memory pressure goes above 70%. The Edge SWG (ProxySG) goes into "regulation" when memory pressure exceeds 80%. Regulation means that the Edge SWG (ProxySG) will no longer accept new connections until it can finish processing current requests and free resources. When an Edge SWG (ProxySG) goes into regulation, all users utilizing that proxy may experience extreme slow internet access, or may not get any response at all, until the regulation is cleared.

Upon reaching the TCP regulation state the proxy physically shuts down incoming TCP connections, to alleviate the memory state that is occurring. By stopping new traffic coming to the Edge SWG (ProxySG)G, it has time to deal with what is currently in memory. Hopefully memory use will then be reduced. When we hit the lower limit, in this case 75%, the Edge SWG (ProxySG) begins accepting new connections again.

Memory pressure is the percentage of physical memory less free and reclaimable memory, of total memory. If there is no free or reclaimable memory in the system, memory pressure is 100%.

It is tracked on the Edge SWG (ProxySG) Management Console, in Statistics > Device, in the Summary section.

The statistic that tracks memory pressure is called TM002.00.1.

The event logs start reporting memory pressure when it reaches 70%.

If an Edge SWG (ProxySG) goes into regulation frequently, or experiences high memory pressure (above 70%) frequently, the unit may be undersized or there may be a memory leak. Please open a case with support for investigation.