Hello, I'm (still) trying to pass data from the network to the block layer without copying. The block layer needs blocks to be contiguous in memory, and may have some alignment restrictions as well. A lot of modern network hardware will receive large packets into separate buffers, so individual large packets will end up in contiguous, aligned buffers. I would like to make use of that, but tcp currently doesn't allow me to control what ends up in which packets. This patch series introduces a new flag for indicating to tcp when it should start a new segment. Using that on the sender side, I can get data over the network with no cpu copying at all. [My last posting on this topic from May 8 is archived here: /lists/netdev/msg197788.html ] Thanks, Andreas Andreas Gruenbacher (3): tcp: Add MSG_NEW_PACKET flag to indicate preferable packet boundaries tcp: Zero-copy receive from a socket into a bio fs: Export bio_release_pages() fs/bio.c | 3 +- include/linux/bio.h | 1 + include/linux/socket.h | 1 + include/net/tcp.h | 3 + net/ipv4/Makefile | 3 +- net/ipv4/tcp.c | 5 +- net/ipv4/tcp_recvbio.c | 168 ++++++++++++++++++++++++++++++++++++++++++++++++ 7 files changed, 180 insertions(+), 4 deletions(-) create mode 100644 net/ipv4/tcp_recvbio.c -- 1.7.10.2 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html