Date: Fri, 20 Mar 2015 21:13:09 -0700 From: Mehmet Erol Sanliturk <m.e.sanliturk@gmail.com> To: Willem Jan Withagen <wjw@digiware.nl> Cc: freebsd-net@freebsd.org, =?UTF-8?B?VmFpZGFzIERhbW/FoWV2acSNaXVz?= <vd@par.lt> Subject: Re: Troubles with 'em' driver and UDP packets Message-ID: <CAOgwaMu4R3ExBH6620HeCUXSgXZ=mveGcf1cwrf4AsEJ3jRXBw@mail.gmail.com> In-Reply-To: <550CA439.7040500@digiware.nl> References: <7F780FA4-E826-4C83-98CC-549FECEDA35E@par.lt> <CAOgwaMuSMVc-pEMB%2BRuqqdiCuBbwuLfpBPF-Oh54R==y-KjtFQ@mail.gmail.com> <E7950DC4-C046-4E18-B4EE-8B31A530E755@par.lt> <550CA439.7040500@digiware.nl>
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On Fri, Mar 20, 2015 at 3:50 PM, Willem Jan Withagen <wjw@digiware.nl> wrote: > On 20/03/2015 10:42, Vaidas Damo=C5=A1evi=C4=8Dius wrote: > > It's not cabling problem :) > > > > Another example with -b and -i : > > > > vd@v0s4:~ % iperf3 -u -c 1.2.3.4 -i4 -b1000m -P1 > > Connecting to host 1.2.3.4, port 5201 > > [ 4] local 1.2.3.3 port 10672 connected to 1.2.3.4 port 5201 > > [ ID] Interval Transfer Bandwidth Total Datagrams > > [ 4] 0.00-4.00 sec 446 MBytes 935 Mbits/sec 1761605 > > [ 4] 4.00-8.00 sec 457 MBytes 958 Mbits/sec 1809551 > > [ 4] 8.00-10.00 sec 228 MBytes 958 Mbits/sec 900740 > > - - - - - - - - - - - - - - - - - - - - - - - - - > > [ ID] Interval Transfer Bandwidth Jitter > Lost/Total Datagrams > > [ 4] 0.00-10.00 sec 1.10 GBytes 949 Mbits/sec 770.668 ms 0/35 > (0%) > > [ 4] Sent 35 datagrams > > > > Result is totaly different. > > > > >> On 20 Mar 2015, at 11:29, Mehmet Erol Sanliturk < > m.e.sanliturk@gmail.com> wrote: > >> I think you use Gigabit CROSS cable ( cat 5e or cat 6 ) . > >> CROSS cable is required if connection is from computer to computer . > >> > >> Only for remaindering . > > to the best of my knowledge: > The standard for 1Gbit requires the media interface to do crossover > automagically, thus removing the requirement for X-cables. > And that also holds for computer <> computer connections. > > --WjW > > > You are right . In case of failures this point may be checked whether it is affecting the communication or not . http://en.wikipedia.org/wiki/Crossover_cable http://en.wikipedia.org/wiki/Ethernet_crossover_cable http://en.wikipedia.org/wiki/Medium_Dependent_Interface#Auto_MDI-X In some computer related shops , they are sold separately as cables and cable connectors . If there were not any need , no one would produce , sell , and buy such two different products .
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