cvs commit: src/sys/net if.c netisr.c netisr.h src/sys/netinet ip_demux.c

Simon 'corecode' Schubert corecode at
Wed Jan 19 09:51:14 PST 2005

On Wednesday, 19. January 2005 18:30, Matthew Dillon wrote:
>   The two solutions are to either ref-count the network interface on a
>   per-packet basis or to synchronize against consumers of the packet.
>   ref-counting is very expensive in an MP system so we have chosen to
>   synchronize against consumers by sending a NOP message to all protocol
>   processing threads and waiting for it to be replied.  This only occurs
> when an interface is being brought down and is not expected to introduce
> any performance issues.

this is really great! i mean, the simplicity is overwhelming... this messaging 
framework really pays off :)


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