Code walkthru of Linux 2.4.18 kernel reveals that we do copy from user space for both linear and nonlinear skbuffs. What is this zerocopy thing then ? If we are copying to different fragments of a non-linear skbuff from user space, we can as well copy to a linear skbuff, to which the headers can be prepended/appended by the protocol stack below. I understand that a perfect zero-copy, wherein the user pages are themselves DMA'ed by the NIC is very clumsy in UNIX (page flipping etc). Am I missing something ?? Thanx tomar - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
