dev.netmap.buf_size and packett size from host

[Eduardo Meyer]

mtu is good, TSO was on, thank you will retest right now.

which other port features should I disable? I only disabled txcsum and
rxcsum before, now tso on the list, anything else in netmap mode?

On Thu, Feb 4, 2016 at 12:29 PM, Luigi Rizzo <rizzo at iet.unipi.it> wrote:

> Make sure you disable TSO on the interface used in netmap
> mode, and then check that you use an MTU of 1500 on that
> interface.
> You should not receive frames larger than MTU coming from
> the host in these conditions.
>
> cheers
> luigi
>
>
> On Thu, Feb 4, 2016 at 3:26 PM, Eduardo Meyer <dudu.meyer at gmail.com>
> wrote:
> > hello,
> >
> > I have a netmap application which has host mode bridge/fwd, with default
> > settings I have the following error some often:
> >
> > 884.260394 [2950] netmap_transmit           igb1 from_host, drop packet
> > size 2962 > 2048
> >
> > the only application which relies on host mode is bird, so those packets
> > are probably from bird daemon, when I get those errors I get bird
> sessions
> > failing and restart
> >
> > I raised dev.netmap.buf_size to 5000 it ajusted to 5120, things got
> better
> > but I still have logs:
> >
> > netmap_transmit           igb1 from_host, drop packet size 5858 > 5120
> >
> > Now the main question is, when dev.netmap.buf_size is 2048 the
> application
> > uses 1.3G of RAM but when I raise to 5120 it uses 3G of RAM.
> >
> > So I need to understand, is this packet size really related from what I
> get
> > from the application packets coming from host to netmap? If so can I
> allow
> > for bigger sizes, like 16k (lo0 mtu) without pre-alloc so much more RAM?
> >
> > thank you
> >
> > E. Meyer
> > _______________________________________________
> > freebsd-net at freebsd.org mailing list
> > https://lists.freebsd.org/mailman/listinfo/freebsd-net
> > To unsubscribe, send any mail to "freebsd-net-unsubscribe at freebsd.org"
>
>
>
> --
> -----------------------------------------+-------------------------------
>  Prof. Luigi RIZZO, rizzo at iet.unipi.it  . Dip. di Ing. dell'Informazione
>  http://www.iet.unipi.it/~luigi/        . Universita` di Pisa
>  TEL      +39-050-2217533               . via Diotisalvi 2
>  Mobile   +39-338-6809875               . 56122 PISA (Italy)
> -----------------------------------------+-------------------------------
>



-- 
===========
Eduardo Meyer
pessoal: dudu.meyer at gmail.com
profissional: ddm.farmaciap at saude.gov.br