2015-05-04 17:29 skrev Barney Cordoba via freebsd-net:
It's not faster than "wedging" into the if_input()s. It simply can't be. Your getting packets at interrupt time as soon as their processed and you there's no network stack involved, and your able to receive and transmit without a process switch. At worst it's the same, without the extra plumbing. It's not rocket science to "bypass the network stack". The only advantage of bringing it into user space would be that it's easier to write threaded handlers for complex uses; but not as a firewall (which is the limit of the context of my comment). You can do anything in the kernel that you can do in user space. The reason a kernel module with if_input() hooks is better is that you can use the standard kernel without all of the netmap hacks. You can just pop it into any kernel and it works.
If my little application is N*1000 lines, the part that needs fast raw network access is N*100 lines and can get that at wirespeed with N*10 lines interfacing with Netmap, then that is IMHO an excellent proposition. I don't see how popping it into the kernel makes any sense.
Ulric _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
