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Its primary purpose is to overrule Net::SNMP's heuristic for maximising the efficiencey of bulk transfers: the goal is to fit as many the maximum number of PDUs into each packet, which of course depends on the size of the PDUs (and their sizes are unknown until the operation is attempted). Like any other heuristic this one can fail under certain cirucmstancescircumstances: If large SNMP tables are collected then it may be necessary to reduce this setting to 10-20 (when used with the default packet size). We have observed this problem in a small number of situations, for example when collecting virtual machine info from VMware ESXi hosts - the strings contained in these tables are really long.
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