On Wed, 2004-12-22 at 01:13, Dmitry Yusupov wrote: > indeed :) > another words if you have modern NIC than you get "zero-copy"(except > copy_to_user()) for free :) what does "checksum on rx" mean??? Don't most of the NIC's support DMA-ing to mem on rx-ing a packet? so what does "zero-copy for free" mean here? thanx, -mandeep > > Regards, > Dima > > On Tue, 2004-12-21 at 14:30 -0500, Jeff Garzik wrote: > > Dmitry Yusupov wrote: > > > Rajat, > > > > > > small correction, if NIC supports DMA operation on receive, than no > > > extra copy required. Therefore sock_recvmsg() and tcp_read_sock > > > > large correction: if NIC supports _checksum_ on receive, then no extra > > copy is required. > > > > Jeff > > > > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
