Why do we not have a recvfile() also which copies data from the socket directly to a file (page cache). Thanx tomar On Wed, 13 Aug 2003, Tomar, Nagendra wrote: > Jamie, > Thanx for ur reply. So this means that this Zero Copy can only > be > used by senders who have to send data from a "file" that supports mmap. > I > just can't fill a buffer in userland and expect it to be sent via Zero > Copy. > Your pointer though clears all my confusions. > > Thanx > tomar > > On Wed, 13 Aug 2003, Jamie Lokier wrote: > > > Nagendra Singh Tomar wrote: > > > 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 ? > > > > Take a look at the sendfile() system call. There is no user space > > data; it can do zerocopy from the page cache. > > > > -- Jamie > > > - : 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
