dev.netmap.buf_size and packett size from host

[Eduardo Meyer]

when i disabled LRO it ruined communication on the port to network (altough
from host was ok), everything else looks good and so far I had no problem
with big packets coming from host, so -tso did it, thank you!

On Thu, Feb 4, 2016 at 12:35 PM, Luigi Rizzo <rizzo at iet.unipi.it> wrote:

> disable all hardware accelerations when using netmap.
>
> cheers
> luigi
>
> On Thu, Feb 4, 2016 at 3:34 PM, Eduardo Meyer <dudu.meyer at gmail.com>
> wrote:
> > 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
>
>
>
> --
> -----------------------------------------+-------------------------------
>  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