[Verse 1] Inside your motherboard mansion, memory lives in districts three DMA zone below sixteen megabytes, where ancient hardware roams free ISA controllers from yesteryear, can only speak this dialect low While Normal zone holds most your data, where thirty-two bit addresses flow [Chorus] DMA, Normal, HighMem too Memory zones split in view NUMA nodes scattered wide Where your data loves to hide Distance matters, latency climbs Cross-socket access costs you time [Verse 2] HighMem floats beyond the boundary that thirty-two bit kernels see Needs special mapping just to touch it, temporary windows hold the key But sixty-four bit systems conquered this architectural divide Now all that memory sits accessible, no more mapping games to ride [Chorus] DMA, Normal, HighMem too Memory zones split in view NUMA nodes scattered wide Where your data loves to hide Distance matters, latency climbs Cross-socket access costs you time [Bridge] Processor zero loves its local RAM, lightning fast and close at hand But reach across to socket three, and watch those nanoseconds expand Topology maps the memory maze, affinity keeps threads aligned Schedule wisely, allocate near, or performance gets left behind [Verse 3] Interleaved spreads pages randomly, bandwidth gains but distance varies While local first keeps data close, though hotspots sometimes make nodes wary Memory controllers multiply, each socket owns its private stash But sharing means you pay the price in interconnect fabric cash [Chorus] DMA, Normal, HighMem too Memory zones split in view NUMA nodes scattered wide Where your data loves to hide Distance matters, latency climbs Cross-socket access costs you time [Outro] When designing scalable systems, remember where the bytes reside Zone-aware and NUMA-conscious keeps performance on your side
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