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zerocopy(kafka)

上传者: 2019-07-13 19:50:59上传 PDF文件 207.93KB 热度 43次
Efficientdatatransferthroughzerocopy1、Theread()callcausesacontextswitch(seeFigure2)fromusermodetokernelmode.Internallyasys_read()(orequivalent)isissuedtoreadthedatafromthefile.Thefirstcopy(seeFigure1)isperformedbythedirectmemoryaccess(DMA)engine,whichreadsfilecontentsfromthedi
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