cvs commit: src/sys/net bpf.c

[David Malone]

> Thanks for taking care of this! It is not very desirable for the same 
> packet to have different timestamps associated with it across different 
> bpf peers. It certainly could cause a problem if people are using 
> timestamps to correlate events from different programs on the same system.

Indeed - calling microtime more than necessary and generating
inconsistent timestamps just didn't seem good.

I think jkim@ has interesting work related to this that might allow
us to exploit hardware that does hardware timestamping of packets.
It is some way down the road though.

	David.