Date: Tue, 30 Dec 2014 16:38:08 +0100 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Carlos Ferreira <carlosmf.pt@gmail.com> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Regarding Netmap internal memory allocation. Message-ID: <CA%2BhQ2%2BiD=2g65ScRBzVVYGRu=jmxksCtMNmObTTnnXfG=Yuu3g@mail.gmail.com> In-Reply-To: <CAJpYY6UH4bU9xYBsAgZm6_h1no9TDPJ9J2TNp4V19rYGrRGuuw@mail.gmail.com> References: <CAJpYY6XmOnYX4bm=YyXr5hoiFLXhoEFXDa44Z_Fn1fHNj8G5_w@mail.gmail.com> <CAJpYY6UH4bU9xYBsAgZm6_h1no9TDPJ9J2TNp4V19rYGrRGuuw@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
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@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@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@av.it.pt
>> Skype & GTalk -> carlosmf.pt@gmail.com
>> LinkedIn -> http://www.linkedin.com/in/carlosmferreira
>>
>
>
>
> --
>
> 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)
-----------------------------------------+-------------------------------
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CA%2BhQ2%2BiD=2g65ScRBzVVYGRu=jmxksCtMNmObTTnnXfG=Yuu3g>