Michael Di Domenico wrote: >> For example, do you want to timestamp interrupts to synchronize >> machinery? Or just note down the timestamps of bittorrent downloads very >> precisely? Just synchronizing an otherwise idling computer is probably >> much easier than a machine that is doing a lot of additional work that >> can mess up the timekeeping by clogging the processor or just creating >> varying stress on the power-supply lines. >> > > The company i work for makes high performance interconnect solutions > for super computers. i'm working on a demo where we're sending data > around a ring and i wanted to timestamp all the packets as it hits > each node of the ring. the servers could be under some stress when > this is running. > > i had a feeling what i wanted to do isn't possible, but i figured i'd > ask some experts before i give up. > > Unless you use packet time stamping cards as used in network characterisation. Errors of around 120ns or so are typical, see:
http://nistboulder.net/Presentations/FCSEFTF2003(final).pdf <http://nistboulder.net/Presentations/FCSEFTF2003%28final%29.pdf> Suitable PCI cards are available. Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
