Luigi one question. Does netmap requires a processor with 64 bits? I'm having some trouble in compiling netmap, using the same Makefile I used previously, but for an Intel IXP435 CPU (Gateworks Cambria).
On 28 June 2014 14:07, Carlos Ferreira <[email protected]> wrote: > Hello to all. > Unfortunately, I have been unable to do the test that Luigi requested due > to the lack of hardware. All the Gateworks Cambria SBC that I have are > currently allocated to another project. Only in about one week, will I have > the opportunity to test it. > As soon as I have news, I will post them. :) > > > On 28 June 2014 09:24, Luigi Rizzo <[email protected]> wrote: > >> >> >> On Saturday, June 28, 2014, Prashant Upadhyaya <[email protected]> >> wrote: >> >>> Hi, >>> >>> Any further news ? >>> >>> Professor Luigi, one question regarding the tx with netmap. >>> Whenever, I write a packet from user space into netmap rings, and if I >>> want netmap to send this out immediately, do I necessarily have to do >>> a ioctl(fd, NIOCTXSYNC, NULL) ? >>> >> >> Yes it is up to the application to decide when to push packets out with a >> txsync or select() or poll(), and unfortunately there is a tradeoff between >> efficiency and latency >> >> Cheers >> Luigi >> >> >>> >>> I have an application which receives packets, does some processing and >>> then sends them out. If I keep doing ioctl's on every packet send, then >>> there will be too may system calls hitting performance, the application >>> can't afford to block it has to return back to polling for the receipt of >>> next packet. >>> >>> On the receive side, I see that I don't have a problem because I can >>> poll the ring without initiating an RXSYNC and whenever in user space I >>> find that there is nothing on the ring (probably half way down the ring >>> size), I do an RXSYNC to get more packets thus saving system calls. >>> >>> But on tx side, I have noticed that unless I do a TXSYNC, the packet >>> does not go out, please let me know if I am missing something. >>> >>> Regards >>> -Prashant >>> >>> >>> >>> On Tue, Jun 17, 2014 at 7:33 PM, Carlos Ferreira <[email protected]> >>> wrote: >>> >>>> Great! :) >>>> I will give you the results as soon as I can get them :) >>>> >>>> >>>> >>>> On 17 June 2014 12:55, Luigi Rizzo <[email protected]> wrote: >>>> >>>> > On Mon, Jun 16, 2014 at 5:30 PM, Carlos Ferreira < >>>> [email protected]> >>>> > wrote: >>>> > >>>> >> Ok, thanks for the enlightenment regarding the loss of performance. >>>> >> >>>> >> One question, just to be sure. Does the kernel module contains the >>>> VALA >>>> >> switch code? Or do I need to compile extra code to have the switch >>>> working? >>>> >> Also, where can I find the documentation to use the Vala Switch? >>>> >> >>>> > >>>> > ​VALE is part of the netmap kernel module, the only thing you need >>>> > to know to use it is port names: >>>> > you can have multiple switch instances with multiple ports each, >>>> > >>>> > valeX:Y means port Y on switch X, X and Y are arbitrary strings >>>> > with the constraint that the whole name must fit 15 characters. >>>> > >>>> > Details in the netmap manpage >>>> > >>>> > cheers >>>> > luigi >>>> > >>>> > >>>> >>>> >>>> -- >>>> >>>> Carlos Miguel Ferreira >>>> Researcher at Telecommunications Institute >>>> Aveiro - Portugal >>>> Work E-mail - [email protected] >>>> Skype & GTalk -> [email protected] >>>> LinkedIn -> http://www.linkedin.com/in/carlosmferreira >>>> _______________________________________________ >>>> [email protected] mailing list >>>> http://lists.freebsd.org/mailman/listinfo/freebsd-net >>>> To unsubscribe, send any mail to "[email protected]" >>>> >>> >>> >> >> -- >> -----------------------------------------+------------------------------- >> Prof. Luigi RIZZO, [email protected] . Dip. di Ing. dell'Informazione >> http://www.iet.unipi.it/~luigi/ . Universita` di Pisa >> TEL +39-050-2211611 . via Diotisalvi 2 >> Mobile +39-338-6809875 . 56122 PISA (Italy) >> -----------------------------------------+------------------------------- >> >> > > > -- > > Carlos Miguel Ferreira > Researcher at Telecommunications Institute > Aveiro - Portugal > Work E-mail - [email protected] > Skype & GTalk -> [email protected] > LinkedIn -> http://www.linkedin.com/in/carlosmferreira > -- Carlos Miguel Ferreira Researcher at Telecommunications Institute Aveiro - Portugal Work E-mail - [email protected] Skype & GTalk -> [email protected] LinkedIn -> http://www.linkedin.com/in/carlosmferreira _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[email protected]"
