Bobby, I believe the jumbo frame problem was fixed. See http://www.mail-archive.com/[email protected]/msg03800.html
Roman On Fri, 17 Dec 2010 11:35:16 -0800 (PST) Bobby Longpocket <[email protected]> wrote > Hi Manel, > > My guess is that it is related to the Ethernet driver on the receive side. > When you set the MTU higher (into jumbogram territory), it probably changes > the receive mechanism to store only the first part of the packet in the > 'data' part of the buffer and sticks the rest off in the 'frags' area of the > buffer. Probably your version of Click doesn't support packets that are > stored this way (and, for all I know, none do). > > Bobby > > > > Hi all, > > > > I am using linuxmodule click-1.7 over linux-2.6.24.7 (but > > this is also > > the case with linux-2.6.18.2) > > If I send packets of 1480 bytes and with the default mtu of > > 1500, the > > the buffer size allocated at the receiver is of 1664, > > > > (p->buffer_length()= 1664 ) which is fine. > > However, when I send large packets of more than 1500 bytes, > > and set > > the mtu to a value > 1500, the buffer allocated at > > the reception is > > always of 256 ((p->buffer_length()= 256)) whatever the > > packet size is. > > So, if I want to access to the data stored beyond the 256 > > bytes in > > that packet, the data I get is erroneous. > > So i am wondering if there is a limitation on the maximum > > buffers > > size? where this limitation is hard-coded? and why does it > > change with > > the mtu? > > > > Thanks for helping > > > > > > Ps: Click scripts are roughly : > > > > Sender : > > RatedSource ->UDPIPEncap -> EtherEncap -> > > ToDevice(eth0) > > Receiver: > > FromDevice(eth0) -> Myelement -> Discard > > > > In Myelement, I only get p->buffer_length() and p-> > > data() and p->end_data() > > > > > > Manel BOURGUIBA > > PhD Candidate > > PHARE - LIP6 - UPMC - Sorbonne Universit?s > > BC169 - Office 25/26-319 > > 4 place Jussieu > > 75252 PARIS cedex 05 > > +33 1 44 27 61 88 > > > > > > _______________________________________________ > click mailing list > [email protected] > https://amsterdam.lcs.mit.edu/mailman/listinfo/click _______________________________________________ click mailing list [email protected] https://amsterdam.lcs.mit.edu/mailman/listinfo/click
