Date: Tue, 30 Dec 2014 17:38:46 +0000 From: Carlos Ferreira <carlosmf.pt@gmail.com> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Regarding Netmap internal memory allocation. Message-ID: <CAJpYY6U=x_PAf0pKoWZTQwCfb0_kmra4Qb4TiUKgXKeTphXidw@mail.gmail.com> In-Reply-To: <CA%2BhQ2%2Bj5JkNn6H9cEdWtsfdv7B5XMto2TQgpYk%2Bvky7v0QQheA@mail.gmail.com> References: <CAJpYY6XmOnYX4bm=YyXr5hoiFLXhoEFXDa44Z_Fn1fHNj8G5_w@mail.gmail.com> <CAJpYY6UH4bU9xYBsAgZm6_h1no9TDPJ9J2TNp4V19rYGrRGuuw@mail.gmail.com> <CA%2BhQ2%2BiD=2g65ScRBzVVYGRu=jmxksCtMNmObTTnnXfG=Yuu3g@mail.gmail.com> <CAJpYY6UGuzVY%2B=_m2RhOfhR40NHxv6uM%2BfWeJpOGkj9DDXWKiw@mail.gmail.com> <CAJpYY6Xy1AZi%2Bb7Dm%2Bn-TnvJJzWEjzQC35%2BntbLm2f4DST=yjQ@mail.gmail.com> <CAJpYY6WGO%2BW8%2BpPfNk1G9WUAO_6DVZf5iqbw-nFP7wnhfxBHQw@mail.gmail.com> <CA%2BhQ2%2Bj5JkNn6H9cEdWtsfdv7B5XMto2TQgpYk%2Bvky7v0QQheA@mail.gmail.com>
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Ok, I'm having some trouble in tuning the amount of memory for netmap. I have been following the man page from FreeBSD <https://www.freebsd.org/cgi/man.cgi?query=netmap&sektion=4#end>; in other to understand the values at /sys/modules/netmap/parameters for linux but I'm having some trouble in understanding what each value actually means. For the following values: dev.netmap.ring_num: 200 -> Is this the number of rings in the Ring Buffer Pool? dev.netmap.ring_size: 36864 -> Is this value, the number of slots per ring? I'm trying to keep the amount of memory used by netmap as low as 4MB - 8MB since I'm going to use only up to 4 NICs and one TAP. Thanks for the help! On 30 December 2014 at 16:16, Luigi Rizzo <rizzo@iet.unipi.it> wrote: > you can #undefine WITH_VALE. > But it is only 20K of code (and 150K of data structures, which you > can further reduce by lowering NM_BRIDGS). > The saving is probably not worth the effort. > > cheers > luigi > > On Tue, Dec 30, 2014 at 5:08 PM, Carlos Ferreira <carlosmf.pt@gmail.com> > wrote: > > By the way, another question. > > Is there a way to not compile the code regarding the VALE switch? I'm > only > > interested in using netmap with Tap Devices and NICs, so I was hoping to > > save some memory. > > > > On 30 December 2014 at 15:47, Carlos Ferreira <carlosmf.pt@gmail.com> > wrote: > >> > >> You mean netmap_mem2.c ? It was there where I found the > NETMAP_BUF_MAX_NUM > >> define. > >> > >> > >> > >> On 30 December 2014 at 15:43, Carlos Ferreira <carlosmf.pt@gmail.com> > >> wrote: > >>> > >>> 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@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@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) > >>>> > >>>> > -----------------------------------------+------------------------------- > >>> > >>> > >>> > >>> > >>> -- > >>> > >>> 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 > > > > > > > > > > -- > > > > 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 > > > > -- > -----------------------------------------+------------------------------- > 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
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