Date: Mon, 24 Mar 2014 10:55:33 +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%2BhAzch_Uuxppxka_-2N9%2BUtYmBLsVJqMyRO15bjBVDWuQ@mail.gmail.com> In-Reply-To: <CADDTU%2BDYxnEwu%2BtWxfofrykd21JLpc3ps8Y28WwF4tgwXqid5A@mail.gmail.com> References: <CADDTU%2BCxQdkzktGnvj4SqpG2N-ccN1vNThtQUoue1H00Dkaf5A@mail.gmail.com> <CA%2BhQ2%2Bjjihzy1P=s%2BAtSzZfTmL-yLRgCh36331azw2OUTafiaQ@mail.gmail.com> <CADDTU%2BDYxnEwu%2BtWxfofrykd21JLpc3ps8Y28WwF4tgwXqid5A@mail.gmail.com>
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On Mon, Mar 24, 2014 at 10:47 AM, soumya panigrahi < soumyapanigrahi@gmail.com> wrote: > > On Mon, Mar 24, 2014 at 2:45 PM, Luigi Rizzo <rizzo@iet.unipi.it> wrote: > >> >> >> >> 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 >> > > Thanks a lot for the quick response. > I will also try to see if we can handle Jumbo frames by tweaking the > buf_size parameter on Linux. > In addition can you advice if NetMap can de-fragment Jumbo packets that > were fragmented as IP packets by intermediate IP device because of MTU size > limitation? > no, netmap does not do fragmentation or reassembly cheers luigi --
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