dev.netmap.buf_size and packett size from host

[Luigi Rizzo]

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)
-----------------------------------------+-------------------------------