[Click] Weird behavior under OSX Snow Leopard...

[Eddie Kohler]

Hi Nick,

That's pretty weird.  The code in FromDevice.u is pretty simple itself; on OS 
X it's a wrapper around the pcap library.  There is no queue inside FromDevice 
itself.  Perhaps this is related to the select()/poll() problems others 
reported.  Can you confirm that tcpdump works as expected, generating packets 
one at a time?  Does OS X pcap support pcap_setnonblock()? 
(config-userlevel.h should have HAVE_PCAP_SETNONBLOCK.)  If not, can you try 
to get rid of the fcntl() on fromdevice.cc:230?

Eddie


Nicholas Weaver wrote:
> I'm seeing some very weird behavior under OSX on FromDevice...
> 
> The very simple code:
> FromDevice(en0, PROMISC true) -> Print("en0") -> Queue -> ToDevice(en1);
> 
> What happens is no packets are received by the Print command until  
> some internal buffer in the FromDevice fills up, and then they are all  
> delivered at once in a big burst, through the queue, and out the en1  
> interface.
> 
> Suggestions?
> 
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