[Verse 1] CPU exhaustion from copying bytes Memory to memory, wasting precious cycles Every buffer transfer steals processing time While your threads are starving, performance stifles Then DMA controllers step into the scene Hardware handles transfers while processors dream [Chorus] Direct access, zero hops Memory streaming, CPU stops Sendfile magic, kernel space No userland, no copying race DMA channels, hardware reign Zero-copy breaks the chain [Verse 2] Traditional reads pull data through your code Kernel to user space, then back down the road Socket writes repeat the costly migration Four context switches kill optimization But sendfile syscall cuts the detour short Kernel to kernel, like a data transport [Chorus] Direct access, zero hops Memory streaming, CPU stops Sendfile magic, kernel space No userland, no copying race DMA channels, hardware reign Zero-copy breaks the chain [Bridge] Splice and vmsplice, pipes connecting streams Memory mapping, virtual schemes Ring buffers spinning, producer consumer Scatter gather lists, bandwidth boomer Network cards with descriptor rings Bypass the CPU, let hardware sing [Verse 3] Web servers pushing massive static files Databases streaming without memory trials Video transcoding, network acceleration Zero-copy powers modern applications When throughput matters more than computation Choose DMA for data liberation [Chorus] Direct access, zero hops Memory streaming, CPU stops Sendfile magic, kernel space No userland, no copying race DMA channels, hardware reign Zero-copy breaks the chain [Outro] From disk to wire, straight and clean No intermediate copying routine Hardware wisdom, software gain Zero-copy breaks the chain
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