Scott TH Hopper commented on Apr 22, 2009

PercentAvailSysResources

I'm not sure whether there could be any quote performance benefit from the parameter itself. My guess is it solved inappropriately balanced memory resources to begin with. D6 really didn't have as much to do with the recommendation to use other methodology than the lack of scalability of the parameter when encountering machines with a large amount of physical memory and the inability for user's of the parameter to calculate appropriate values that would make it actually change system behavior. In general, D8's new buffer pool cap resolves most issues that other methodologies to set resources created.