Date: Tue, 21 May 2013 07:52:24 -0700 (PDT) From: Barney Cordoba <barney_cordoba@yahoo.com> To: Hooman Fazaeli <hoomanfazaeli@gmail.com>, Luigi Rizzo <rizzo@iet.unipi.it> Cc: freebsd-net@freebsd.org Subject: Re: netmap bridge can tranmit big packet in line rate ? Message-ID: <1369147944.27968.YahooMailClassic@web121606.mail.ne1.yahoo.com> In-Reply-To: <20130521143906.GA80993@onelab2.iet.unipi.it>
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--- On Tue, 5/21/13, Luigi Rizzo <rizzo@iet.unipi.it> wrote: > From: Luigi Rizzo <rizzo@iet.unipi.it> > Subject: Re: netmap bridge can tranmit big packet in line rate ? > To: "Hooman Fazaeli" <hoomanfazaeli@gmail.com> > Cc: freebsd-net@freebsd.org > Date: Tuesday, May 21, 2013, 10:39 AM > On Tue, May 21, 2013 at 06:51:12PM > +0430, Hooman Fazaeli wrote: > > On 5/21/2013 5:10 PM, Barney Cordoba wrote: > > > > > > --- On Tue, 5/21/13, liujie <liujie@263.net> > wrote: > > > > > >> From: liujie <liujie@263.net> > > >> Subject: Re: netmap bridge can tranmit big > packet in line rate ? > > >> To: freebsd-net@freebsd.org > > >> Date: Tuesday, May 21, 2013, 5:25 AM > > >> Hi, Prof.Luigi RIZZO > > >> > > >> Firstly i should thank you for netmap. I > tried to send a > > >> e-mail to you > > >> yestoday, but it was rejected. > > >> > > >> I used two machines to test netmap > bridge. all with i7-2600 > > >> cpu and intel > > >> 82599 dual-interfaces card. > > >> > > >> One worked as sender and receiver with > pkt-gen, the other > > >> worked as bridge > > >> with bridge.c. > > >> > > >> as you said,I feeled comfous too when i > saw the big packet > > >> performance > > >> dropped, i tried to change the memory > parameters of > > >> netmap(netmap_mem1.c > > >> netmap_mem2.c),but it seemed that can > not resove the > > >> problem. > > >> 60-byte packet send 14882289 > pps recv > > >> 13994753 pps > > >> 124-byte > > > >> send 8445770 pps > > > >> recv 7628942 pps > > >> 252-byte > > > >> send 4529819 pps > > > >> recv 3757843 pps > > >> 508-byte > > > >> send 2350815 pps > > >> recv 1645647 pps > > >> 1514-byte > send > > >> 814288 pps > recv 489133 > > >> pps > > > These numbers indicate you're tx'ing 7.2Gb/s with > 60 byte packets and > > > 9.8Gb/s with 1514, so maybe you just need a new > calculator? > > > > > > BC > > > _______________________________________________ > > > > > AsBarney pointed outalready, your numbers are > reasonable. You have almost saturated > > the link with 1514 byte packets.In the case of 64 byte > packets, you do not achieve line > > rate probably because of the congestion on the bus.Can > you show us "top -SI" output on the > > sender machine? > > the OP is commenting that on the receive side he is seeing a > much > lower number than on the tx side (A:ix1 489Kpps vs A:ix0 > 814Kpps). > > [pkt-gen -f tx ix0]-->--[ix0 bridge ] > [ HOST A > ] [ HOST B ] > [pkt-gen -f rx ix1]--<--[ix1 > ] > > What is unclear is where the loss occurs. > > cheers > luigi The ixgbe driver has mac stats that will answer that. Just look at the sysctl output. BC
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