Re: [uml-devel] Re: What to do with uml_switch?

[Michael Richardson <mcr@sandelman.ottawa.on.ca>]

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>>>>> "Steve" == Steve Schmidtke <steve_schmidtke@hotmail.com> writes:
    Steve> It would be useful if daemon_user.c could be run in a
    Steve> synchronous mode such that packets are guaranteed delivered
    Steve> to the switch and guaranteed delivered to a host.  The switch
    Steve> could then mangle packets in a deterministic fashion for
    Steve> testing.

  Yes, that would be useful.
  From a practical point of view:
       s/SOCK_DGRAM/SOCK_STREAM/

  not a very useful way to operate if there is any network load, but it
may be okay for regression testing. Also realize that Linux Unix domain
datagram sockets are mostly reliable. (BSD does not have this property)

    Steve> It would also be interesting if packets could be passed in
    Steve> shared memory.  I'm wondering if it would be faster and more
    Steve> reliable at the same time.

  On a uniprocessor, perhaps.
  Evidence is that on multiprocessor systems, shared memory is not
faster than copying because of cache concurency costs.

  My opinion is that this is premature optimization.

  I having been thinking of booting all my UMLs up to single-user
prompt, swsusp them, and restore swsusp each time instead of booting
them. That may be a larger win for me.

- -- 
]       ON HUMILITY: to err is human. To moo, bovine.           |  firewalls  [
]   Michael Richardson,    Xelerance Corporation, Ottawa, ON    |net architect[
] mcr@xelerance.com      http://www.sandelman.ottawa.on.ca/mcr/ |device driver[
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [




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