Network buffers are a completely different animal, also harder to optimize... Disk IO buffers, it's easy nowadays, just use something like a MB, which is just

Network buffers are a completely different animal, also harder to optimize... Disk IO buffers, it's easy nowadays, just use something like a MB, which is just fine for almost any application, and doesn't stack up to much memory use (unless you're writing many files concurrently, which can bring it's own problems as well)