zerocopy(kafka)
Efficientdatatransferthroughzerocopy1、Theread()callcausesacontextswitch(seeFigure2)fromusermodetokernelmode.Internallyasys_read()(orequivalent)isissuedtoreadthedatafromthefile.Thefirstcopy(seeFigure1)isperformedbythedirectmemoryaccess(DMA)engine,whichreadsfilecontentsfromthedi
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