Date: Tue, 31 Oct 2017 07:05:40 -1000 From: Kent Kuriyama <kent.kuriyama@gmail.com> To: Matthew Seaman <m.seaman@infracaninophile.co.uk> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Gigabit Ethernet adapter problem Message-ID: <CACArijAhPAB8Hi3i0PscKKSNebx_vthtRFWdP51kz9Z2HDdNDw@mail.gmail.com> In-Reply-To: <6ea04a6e-0c25-16e4-8007-8b647e473813@infracaninophile.co.uk> References: <59F895A5.1040809@gmail.com> <6ea04a6e-0c25-16e4-8007-8b647e473813@infracaninophile.co.uk>
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I had the same problem in which a supposedly GigE connection would negotiate down to 100 Mbs. The problem as a bad NIC on my side. I have also seen 100 Mbs speeds when the jumper cable that I used was not up to par. On Tue, Oct 31, 2017 at 5:43 AM, Matthew Seaman < m.seaman@infracaninophile.co.uk> wrote: > On 31/10/2017 15:24, Ernie Luzar wrote: > > > > em - Intel(R) PRO/1000 Gigabit Ethernet adapter driver > > > > The boot messages show the Gigabit Ethernet adapter is correctly > > identified at boot time as shown below. > > > > em0: <Intel(R) PRO/1000 Network Connection 7.6.1-k> port 0xf080-0xf09f > > mem 0xf7d00000-0xf7d1ffff,0xf7d3c000-0xf7d3cfff irq 20 at > > device 25.0 on pci0 > > em0: Using an MSI interrupt > > em0: Ethernet address: d0:50:99:93:75:98 > > em0: netmap queues/slots: TX 1/1024, RX 1/1024 > > > > > > But after the system is up and running ifconfig em0 shows > > > > em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> > > metric 0 mtu 1500 > > options=4019b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM, > > TSO4,VLAN_HWTSO> > > ether d0:50:99:93:75:98 > > hwaddr d0:50:99:93:75:98 > > inet 10.0.10.2 netmask 0xff000000 broadcast 10.255.255.255 > > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> > > media: Ethernet autoselect (100baseTX <full-duplex>) > > status: active > > > > and we see that (100baseTX <full-duplex>) has been selected as default > > and it should be (1000baseTX <full-duplex>). > > > > How do I force the Ethernet adapter into Gigabit mode? > > This sort of down-grade is either because the switch port you've go the > machine plugged into is somehow set to negotiate to 100Mb/s, or else > you've got some dodgy cabling and consequently the system has backed off > to 100Mb/s because it can't sustain 1000Mb/s. > > Try looking at the output of 'netstat -i' -- if there are any errors > listed in the ierrs or oerrs columns, and particularly if they are > increasing over time. That indicates some sort of hardware problem, > usually due to a network cable having broken or been kinked or even tied > too tightly into a bundle. Start by swapping out the ethernet cable -- > it's cheap to replace. > > Cheers, > > Matthew > > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions- > unsubscribe@freebsd.org" >
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