Sun V890: Forcing Full Duplex Under Solaris 10
Abstract:
When a server boots, the network card will negotiate with the network switch how to communicate. Various settings such as speed and duplex are often part of the auto-negotiation protocol. Occasionally, a server will not negotiate with the network switch the highest possible throughput. The duplex setting may improperly negotiate to half, which could result in collisions and errors, but this can be resolved through manually setting the port characteristics.
Background:
The Sun V890 offers various ethernet ports out-of-the box when purchased from Sun. Some of these port types include: ge, eri, qfe. To see which ports are installed on a platform, one can use the "dladm show-dev" command.
Symptoms:
Bad negotiation is often determined by poor performance.
If a network switch negotiates incorrectly, the results are clear with Solaris 10.
The duplex can be fixed dynamically. To correct instance "2" of the "qfe" interface:
Duplex correction can be easily verified.
If the problem was experienced on instance "0" of the "eri" interface, the following commands could be used to dynamically adjust the interface to 100 Mbs and full duplex.
Kernel Inquiry:
The configuration and statistics regarding the network interfaces can also be retrieved through a kernel inquiry. This can be used for operating systems earlier than Solaris 10.
Abstract:
When a server boots, the network card will negotiate with the network switch how to communicate. Various settings such as speed and duplex are often part of the auto-negotiation protocol. Occasionally, a server will not negotiate with the network switch the highest possible throughput. The duplex setting may improperly negotiate to half, which could result in collisions and errors, but this can be resolved through manually setting the port characteristics.
Background:
The Sun V890 offers various ethernet ports out-of-the box when purchased from Sun. Some of these port types include: ge, eri, qfe. To see which ports are installed on a platform, one can use the "dladm show-dev" command.
Symptoms:
Bad negotiation is often determined by poor performance.
sunv890/user$ netstat -in
Name Mtu Net/Dest Address Ipkts Ierrs Opkts Oerrs Collis Queue
lo0 8232 127.0.0.0 127.0.0.1 8854 0 8854 0 0 0
qfe0 1500 192.127.224.0 192.127.224.33 6258 0 1460 0 0 0
qfe1 1500 172.39.0.0 172.39.5.33 73075033 0 1774172 0 0 0
qfe2 1500 192.127.254.0 192.127.254.9 10190603 0 6153115 176 546372 0 Determining Bad Negotiation:If a network switch negotiates incorrectly, the results are clear with Solaris 10.
sunv890/root# dladm show-dev
ge0 link: down speed: 0 Mbps duplex: unknown
eri0 link: down speed: 0 Mbps duplex: unknown
qfe0 link: up speed: 100 Mbps duplex: full
qfe1 link: up speed: 100 Mbps duplex: full
qfe2 link: up speed: 100 Mbps duplex: half
qfe3 link: down speed: 0 Mbps duplex: unknownCorrecting Bad Negotiation:The duplex can be fixed dynamically. To correct instance "2" of the "qfe" interface:
sunv890/root# ndd -set /dev/qfe instance 2
sunv890/root# ndd -set /dev/qfe adv_100T4_cap 0
sunv890/root# ndd -set /dev/qfe adv_100fdx_cap 1
sunv890/root# ndd -set /dev/qfe adv_100hdx_cap 0
sunv890/root# ndd -set /dev/qfe adv_10fdx_cap 0
sunv890/root# ndd -set /dev/qfe adv_10hdx_cap 0
sunv890/root# ndd -set /dev/qfe adv_autoneg_cap 0Verifying Corrected Negotiation:Duplex correction can be easily verified.
sunv890/root# dladm show-dev
ge0 link: down speed: 0 Mbps duplex: unknown
eri0 link: down speed: 0 Mbps duplex: unknown
qfe0 link: up speed: 100 Mbps duplex: full
qfe1 link: up speed: 100 Mbps duplex: full
qfe2 link: up speed: 100 Mbps duplex: full
qfe3 link: down speed: 0 Mbps duplex: unknownOther Interfaces:If the problem was experienced on instance "0" of the "eri" interface, the following commands could be used to dynamically adjust the interface to 100 Mbs and full duplex.
sunv890/root# ndd -set /dev/eri instance 0
sunv890/root# ndd -set /dev/eri adv_100T4_cap 0
sunv890/root# ndd -set /dev/eri adv_100fdx_cap 1
sunv890/root# ndd -set /dev/eri adv_100hdx_cap 0
sunv890/root# ndd -set /dev/eri adv_10fdx_cap 0
sunv890/root# ndd -set /dev/eri adv_10hdx_cap 0
sunv890/root# ndd -set /dev/eri adv_autoneg_cap 0If the problem was experienced on instance "0" of the "ge" interface, the following commands could be used to dynamically adjust the interface to 1000 Mbs and full duplex with 802.3 transmit and receive flow control.sunv890/root# ndd -set /dev/ge instance 0
sunv890/root# ndd -set /dev/ge adv_1000fdx_cap 1
sunv890/root# ndd -set /dev/ge adv_1000hdx_cap 0
sunv890/root# ndd -set /dev/ge adv_pauseTX 1
sunv890/root# ndd -set /dev/ge adv_pauseRX 1
sunv890/root# ndd -set /dev/ge adv_1000autoneg_cap 0
Kernel Inquiry:
The configuration and statistics regarding the network interfaces can also be retrieved through a kernel inquiry. This can be used for operating systems earlier than Solaris 10.
sunv890/root# kstat qfe
module: qfe instance: 0
name: qfe0 class: net
align_errors 0
allocbfail 0
babble 0
brdcstrcv 36739
brdcstxmt 493
buff 0
carrier_errors 0
...
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