Date: Thu, 4 Feb 2016 15:35:09 +0100 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Eduardo Meyer <dudu.meyer@gmail.com> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: dev.netmap.buf_size and packett size from host Message-ID: <CA%2BhQ2%2BiLhC4%2BUA=k_Q%2BRyALs_X%2BCYAK8thkKqtatyBHGyTSkcg@mail.gmail.com> In-Reply-To: <CAEqdE_7aN4DEa2fLBnamBSeEK5UT8ePdBFyKu=R75FdXnPB7hg@mail.gmail.com> References: <CAEqdE_6ZVTbLebLoNbQUy916Pv5up5A9vrymrV4yE_DBXZJ-yw@mail.gmail.com> <CA%2BhQ2%2Bg0FujuKvzxH_Nae6Pq2X%2BzJQWOrrY3RSefDAiwssASxg@mail.gmail.com> <CAEqdE_7aN4DEa2fLBnamBSeEK5UT8ePdBFyKu=R75FdXnPB7hg@mail.gmail.com>
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disable all hardware accelerations when using netmap. cheers luigi On Thu, Feb 4, 2016 at 3:34 PM, Eduardo Meyer <dudu.meyer@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@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@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@freebsd.org mailing list >> > https://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 +39-050-2217533 . via Diotisalvi 2 >> Mobile +39-338-6809875 . 56122 PISA (Italy) >> -----------------------------------------+------------------------------- > > > > > -- > =========== > Eduardo Meyer > pessoal: dudu.meyer@gmail.com > profissional: ddm.farmaciap@saude.gov.br -- -----------------------------------------+------------------------------- Prof. Luigi RIZZO, rizzo@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) -----------------------------------------+-------------------------------
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