[Ns-bugs] [Bug 141] udp tx buffer is not fixed size

Sat Feb 16 06:31:18 PST 2008

http://www.nsnam.org/bugzilla/show_bug.cgi?id=141

gjcarneiro at gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |gjcarneiro at gmail.com

------- Comment #1 from gjcarneiro at gmail.com  2008-02-16 09:31 -------
I don't think UDP sockets have transmit buffer in Linux. See
http://book.chinaunix.net/special/ebook/oreilly/Understanding_Linux_Network_Internals/0596002556/understandlni-CHP-21-SECT-1.html#IDX-CHP-21-2574

    """udp_sendmsg first calls ip_append_data, and then forces the immediate
transmission of the data with udp_push_pending_frames only if corkreq is
false"""

But the "cork" option is an advanced udp socket option, disabled by default. 
By default UDP has no buffering; there's only a transmit queue in the netdevice
itself.

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