Date: Fri, 11 Jul 2014 17:07:31 +0100 From: Carlos Ferreira <carlosmf.pt@gmail.com> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, Prashant Upadhyaya <praupadhyaya@gmail.com> Subject: Re: netmap Message-ID: <CAJpYY6V4ejOtJWjq0TikT%2B2ScOo=Nm=0cwezWgba_i0070_-SQ@mail.gmail.com> In-Reply-To: <CAJpYY6VBtynBeSQkVprz%2B6BY=TF9RcGEV9hWWKnVQzUvfpKh%2BQ@mail.gmail.com> References: <CAJpYY6Wj6NkYVdPzitswLQ2oVoX9JAv5tCnzbP6icsgJTdfm8Q@mail.gmail.com> <CA%2BhQ2%2BhHz2FKUkCRnHiGAVxZqxY5WHPPo87mVgSnSmPzovNLWw@mail.gmail.com> <CAJpYY6V6Ewc%2BXQYBi3BQbFtWgLiFKN_qmBLjAx1HyWhB9Q0vcg@mail.gmail.com> <CAJpYY6VJ9ih1ON1s1mnzrc-P7Xa_vsVS3UC49gnii0cLX%2B=TNA@mail.gmail.com> <20140614101523.GD22187@onelab2.iet.unipi.it> <CAJpYY6Usfv98OEsgXedP5MCqdJsd_rz7N4EhgRmP2NcxZ9eQ9g@mail.gmail.com> <CA%2BhQ2%2Bj4RrCxjSu79Zt9BVnKUTcRxO615msGH5_uoLrEinbcPQ@mail.gmail.com> <CAJpYY6XBg8=g7sjVbu%2B6%2BEG1-vW1dymsvD8pL-EB08B=_z=usA@mail.gmail.com> <CAPBAu3U9_VTUCPk_61maSAyxM_VHgSui8kbT65=b-jsXNzqJcA@mail.gmail.com> <CA%2BhQ2%2Bgi9SiZuM4Nvw4CjJG9sX3cNZ4KNfXSkDcFfcPvW4A22Q@mail.gmail.com> <CAJpYY6VBtynBeSQkVprz%2B6BY=TF9RcGEV9hWWKnVQzUvfpKh%2BQ@mail.gmail.com>
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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 <carlosmf.pt@gmail.com> 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 ha= ve > the opportunity to test it. > As soon as I have news, I will post them. :) > > > On 28 June 2014 09:24, Luigi Rizzo <rizzo@iet.unipi.it> wrote: > >> >> >> On Saturday, June 28, 2014, Prashant Upadhyaya <praupadhyaya@gmail.com> >> 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 betw= een >> 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 <carlosmf.pt@gmail.com= > >>> wrote: >>> >>>> Great! :) >>>> I will give you the results as soon as I can get them :) >>>> >>>> >>>> >>>> On 17 June 2014 12:55, Luigi Rizzo <rizzo@iet.unipi.it> wrote: >>>> >>>> > On Mon, Jun 16, 2014 at 5:30 PM, Carlos Ferreira < >>>> carlosmf.pt@gmail.com> >>>> > 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? >>>> >> >>>> > >>>> > =E2=80=8BVALE is part of the netmap kernel module, the only thing yo= u 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 - cmf@av.it.pt >>>> Skype & GTalk -> carlosmf.pt@gmail.com >>>> LinkedIn -> http://www.linkedin.com/in/carlosmferreira >>>> _______________________________________________ >>>> freebsd-net@freebsd.org mailing list >>>> http://lists.freebsd.org/mailman/listinfo/freebsd-net >>>> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >>>> >>> >>> >> >> -- >> -----------------------------------------+------------------------------= - >> Prof. Luigi RIZZO, rizzo@iet.unipi.it . 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 - cmf@av.it.pt > Skype & GTalk -> carlosmf.pt@gmail.com > LinkedIn -> http://www.linkedin.com/in/carlosmferreira > --=20 Carlos Miguel Ferreira Researcher at Telecommunications Institute Aveiro - Portugal Work E-mail - cmf@av.it.pt Skype & GTalk -> carlosmf.pt@gmail.com LinkedIn -> http://www.linkedin.com/in/carlosmferreira
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