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“Traditional servers copy data: Disk $ o$ OS PageCache $ o$ JVM/App Buffer $ o$ Socket Buffer $ o$ NIC. Svelte/Kafka commit logs use the Linux sendfile() syscall to transfer data directly from OS PageCache to Network Interface Card (NIC), skipping CPU memory copies.”
Bypassing user-space memory buffers using Linux sendfile() and kernel PageCache.
// Linux sendfile Syscall Architecture
// C/JVM Internals:
// FileChannel.transferTo(position, count, targetSocketChannel);
// Bypasses JVM user-space buffer completely.Keeping JVM heaps small (e.g. 6-8GB) allows remaining system RAM to act as a massive multi-gigabyte PageCache pool.