Date: Mon, 24 Mar 2014 10:15:31 +0100 From: Luigi Rizzo <rizzo@iet.unipi.it> To: soumya panigrahi <soumyapanigrahi@gmail.com> Cc: Giuseppe Lettieri <giuseppe.lettieri73@gmail.com>, Vincenzo Maffione <v.maffione@gmail.com>, "freebsd-net@freebsd.org" <net@freebsd.org> Subject: Re: Handling Jumbo Packets Message-ID: <CA%2BhQ2%2Bjjihzy1P=s%2BAtSzZfTmL-yLRgCh36331azw2OUTafiaQ@mail.gmail.com> In-Reply-To: <CADDTU%2BCxQdkzktGnvj4SqpG2N-ccN1vNThtQUoue1H00Dkaf5A@mail.gmail.com> References: <CADDTU%2BCxQdkzktGnvj4SqpG2N-ccN1vNThtQUoue1H00Dkaf5A@mail.gmail.com>
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On Mon, Mar 24, 2014 at 7:40 AM, soumya panigrahi <soumyapanigrahi@gmail.com > wrote: > Hi, > > First of all I would like to thank you all for developing an awesome > packet capturing framework. > I have been using it recently and find it very very fast and efficient. > > However off late I am trying to capture Jumbo packets on the network for > the following scenario's but that doesn't seem to be working. > the sysctl tree dev.netmap (on FreeBSD) or the filesystem /sys/module/netmap_lin/parameters (on Linux) have a number of parameters that control buffer numbers and sizes. In particular "buf_size" is used to allocate packet buffers and you can bump it up from 2048 to something larger to accommodate jumbo buffers. Depending on the NIC you may need to do something in the initialization of the NIC itself to allow sending/receiving frames larger than 1518 bytes, but I'd just try and see whether it works for you now. cheers luigi > Please suggest in its present form is NetMap capable of handling the below > scenario's w.r.t Jumbo frames? If how do we have to some special handling > w.r.t to this? > > 1) Netmap is receiving un-fragmented Jumbo frame. In this case is NetMap > capable of passing on the Jumbo packet to the user? > 2) Netmap receving fragmented Jumbo frames. In this case is NetMap > capable of reassembling the fragmented packets and deliver the assembled > packet to the user? > > I have been stuck with this issue for some time now. A quick response > would help a great deal. > > Thanks, > Soumya Panigrahi > -- -----------------------------------------+------------------------------- 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) -----------------------------------------+-------------------------------
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