Jens,
Yes, I did try to use "--full-duplex" as an option for a 'receiver' image. Based my reading of the information on this page
-------------------------------- http://udpcast.linux.lu/cmd.html
Networking options
The following networking options should be supplied both on the sender and the receivers:
--full-duplex
and
--half-duplex
--------------------------------
I thought it would at least be possible to use "--full-duplex" as an option (whether it was a good idea or not). But, more of the story follows.
I booted twenty PCs using a cast-o-matic 'receiver' image, built without specifying "--full-duplex" (which, I assume uses "--half-duplex" by default - given information on the same web page as mentioned above). I used the "--full-duplex" switch to start the 'sender', but the transfer stopped after roughly 160MB had been sent. I started a new transfer session; 'receiver' systems were booted with the same cast-o-matic image, the udpcast sender was started using the "--half-duplex" switch, and all went relatively well, aside from a lot of 'not ready' messages from the receivers on the 'sender' console.
Not to distract from the main question of whether one can specify half- or full-duplex in cast-o-matic images, I'll also mention that the 'receiver' PCs don't seem to be auto negotiating half/full duplex connections with the switch to which they're connected.
Jens Breuer wrote:
Hello Tom,
could it be that you specified --full-duplex as a command for the receiver? I think it doesn't make sense for the receiver as the part that spits the traffic and therefore has to take care of the amount of traffic is solely the sender. However, at my end the sender happily eats the option whereas the receiver errors out.
Kind regards Jens
On Tue, Jan 19, 2010 at 7:45 PM, Tom Carpenter tomc@bio.umass.edu wrote:
Is "--half-duplex" the default setting used by cast-o-matic images? I tried adding "--full-duplex" to the "Additional Udpcast command-line parameters" field of the current "Cast-o-matic Stage 2" configuration page, but I get the error "unrecognized option '--full-duplex'". (Note: '--full-duplex' was entered as the first of two command-line parameters.)
-- Tom Carpenter
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