Performance Optimization Guide: Difference between revisions

Performance Optimization Guide (view source)

Revision as of 14:20, 8 May 2020

306 bytes added , 8 May 2020

→‎Overload at low analyzer load

Ralf

546

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 If none of these options are applicable, you need to upgrade the '''Allegro Network Multimeter''' to a larger model with more performance (Allegro 1000 to 3000 or 3000 to 5000).
-=== Overload at low analyzer load ===
+=== Skipped packets at low analyzer load ===
-This happens if the analyzers of the Allegro are in a powersafe mode and a very high and large burst of one connection arrives at the Allegro. This issue has happened at customer installations with 40G Links, an average saturation less than 5GBit/s and connection bursts above 10GBit/s. This can lead to minor packet drops as the wakeup of the analyzers is not fast enough. The solution is to use the [[#Sink Mode]] and to activate the '''Analyzer queue overcommit''' at '''Settings''' → '''Global settings''' → '''Expert settings'''. This mode allows to buffer network bursts. This mode is not available for the bridge mode.
+The '''Allegro Network Multimeter''' conserves energy in very low traffic situations. Large bursts of packets can lead to a high traffic situation so the analyser threads cannot keep up with the incoming packets fast enough during the period of power adjustment. After that small period of time, the analyser threads are again fast enough to process the traffic.
+This can be identified if packets are not processed while the load of the system is still not very high at the same time.
+If this occurs, the option '''Analyzer queue overcommit''' at '''Settings''' → '''Global settings''' → '''Expert settings''' can be enabled. This option can only be used in '''Sink mode''' and it increases the queue size to be able to buffer network burts during a small time period. The disadvantage is that the queues are overcommitted so it can happen that the network card does not have enough buffers available for incoming packets.
 [[File:Queue overcommit.png|600px]]
 === Overload and not-balanced analyzer load ===