![]() ![]() Thus, you want to set a limit as to how much memory a single connection can consume, balanced based on peak profile usage. This memory must be fairly allocated with per socket/connection thresholds to reasonably protect you from starving the entire system with just a handful of network connections. Based on my research, BSD, the underlying OS that OS X is built on top of, defaults to assigning 64MB of memory to the mbuf pool. The default value seems to be set based on the amount of physical RAM your system has installed. This is the basis for determining most of the buffer and socket threshold values which can impact network throughput and connection scalability. This boot-time parameter governs the scalability of network connections, in terms of the simultaneous number supported and how much data can be queued in either direction. Probably the most fundamental yet debatable system option for network tuning is memory allocation to the mbuf buffer pools. You can also find my latest updates for High Sierra and Mojave in my most recent post here. However, please refer to my original post for the gory details and caveats related to previous OSX releases. Much of this configuration and the settings are backwards compatible to previous OSX releases. This updated post is intended to address performance tuning the IP stack on OSX Mavericks and, hopefully, eliminate some of the confusion around many of the caveats and options, as this is a fairly complex topic. ![]() My previous post on this topic has gotten over 55,000 views and generated quite a bit of feedback and questions. This is my second post on performance tuning the OSX network stack.
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