Regarding Netmap internal memory allocation.

[Carlos Ferreira]

Ok thanks. I was hoping not having to recompile the module, but it's ok.
Thank you for the info!


On 30 December 2014 at 15:38, Luigi Rizzo <rizzo at iet.unipi.it> wrote:

> you can reduce the amount of ram (buffers, mostly) by
> tweaking the values in netmap_mem2.c ::
> struct netmap_obj_params netmap_params[NETMAP_POOLS_NR] = {
> ...
> }
>
> or you can simply modify the constant
>
> netmap_mem2.h:#define NETMAP_BUF_MAX_NUM 20*4096*2
>
> to something smaller that suits an openwrt box
> (in which i am very interested, as I'd like to deploy one of these soon)
>
> cheers
> luigi
>
>
> On Tue, Dec 30, 2014 at 4:12 PM, Carlos Ferreira <carlosmf.pt at gmail.com>
> wrote:
> > Update:
> >
> > I noticed that the netmap module was still crashing, after  changing the
> > OpenWRT VM ram to 256MB. I now raised to 1GB and it no longer crashed.
> The
> > netmap module is now consuming about 350MB of Ram, which for my
> objectives
> > is just too much...
> >
> > On 30 December 2014 at 14:06, Carlos Ferreira <carlosmf.pt at gmail.com>
> wrote:
> >
> >> To Luigi and to whom may be able to help
> >>
> >> Hello all.
> >>
> >> Is it possible to reduce the size of the memory buffer allocated by the
> >> netmap module?
> >> I'm asking this because I was implementing some testing code, using NICs
> >> and a Tap device in an OpenWRT VM with 64MB of RAM.
> >> Because of the small RAM amount, the nm_open crashed when the program
> >> tried to netmap the tap device, after I previously netmapped one NIC
> >> successfully.
> >> After the crash, I bumped the VM RAM to 256MB and the test program ran
> >> well, but not without me noticing that the VM RAM consumption was
> >>  increased about 90 MB by netmap.
> >>
> >> Resuming, I want to know if there is a way to reduce the memory buffer
> >> allocation, without recompiling the netmap kernel module.
> >>
> >> Thank you for the attention.
> >>
> >> --
> >>
> >> Carlos Miguel Ferreira
> >> Researcher at Telecommunications Institute
> >> Aveiro - Portugal
> >> Work E-mail - cmf at av.it.pt
> >> Skype & GTalk -> carlosmf.pt at gmail.com
> >> LinkedIn -> http://www.linkedin.com/in/carlosmferreira
> >>
> >
> >
> >
> > --
> >
> > Carlos Miguel Ferreira
> > Researcher at Telecommunications Institute
> > Aveiro - Portugal
> > Work E-mail - cmf at av.it.pt
> > Skype & GTalk -> carlosmf.pt at gmail.com
> > LinkedIn -> http://www.linkedin.com/in/carlosmferreira
> > _______________________________________________
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>
>
>
> --
> -----------------------------------------+-------------------------------
>  Prof. Luigi RIZZO, rizzo at 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 at av.it.pt
Skype & GTalk -> carlosmf.pt at gmail.com
LinkedIn -> http://www.linkedin.com/in/carlosmferreira