Does anyone know if increasing the SHM Read Buffer RAM allocation will have a positive impact on the length of the Packet Driver Queue. We have increased it on several of our AMD's that tend to sample packets and it has resolved that issue. Generally, from my experience, it seems that if the packet driver queue gets overwhelmed the sampling kicks in.
So, it made me wonder if there is a relationship between the two settings.
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The packet driver queue length equals to the current SHM buffer usage level. Increasing SHM size will allow the queue to grow larger and prevent drops for a longer time, but if the AMD is constantly unable to keep up with the traffic level, drops will happen eventually anyway.
Basically, increasing SHM size will help dealing with relatively short traffic bursts, but won't help if the AMD is constantly overloaded.