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I was under the (possibly mistaken) impression that Direct Memory Access (DMA) hardware could move data straight from the Disk Cache to the Network card without
by sambeau 16y ago
I was under the (possibly mistaken) impression that Direct Memory Access (DMA) hardware could move data straight from the Disk Cache to the Network card without touching the CPU Caches at all.
- dedward 16y agoTrue - DMA can do that - but then you'd have to have something managing the network stack - the kernel manages tcp/ip. From the man page: "sendfile() copies data between one file descriptor and another. Because this copying is done within the kernel, sendfile() is more efficient than the combination of read(2) and write(2), which would require transferring data to and from user space."