topic Re: whats my nic speed? in Operating System - Linux

whats my nic speed?

khilari — Fri, 05 Jan 2007 10:16:23 GMT

Hi guys, i wanted to know as to how do i know what is my nic speed, is it 100 megs or 1 gig. Lets say if it is 100 megs so how do i change to 1 gig.
Thanks

Re: whats my nic speed?

Victor Semaska_3 — Fri, 05 Jan 2007 10:26:33 GMT

On RedHat Linux it's mii-tool.

Vic

Re: whats my nic speed?

khilari — Fri, 05 Jan 2007 10:29:24 GMT

what does this mean??
[root@linux4 sbin]# ./mii-tool
eth0: negotiated 100baseTx-FD, link ok

Re: whats my nic speed?

Oviwan — Fri, 05 Jan 2007 11:38:11 GMT

Hy

That means you have a 100mb card. you have to buy a 1gb card. but if you have a 100mb switch between your machine and the server the connection will be only 100mb

Regards

Re: whats my nic speed?

Victor Semaska_3 — Fri, 05 Jan 2007 13:28:27 GMT

Oviwan,

Not necessarily. That is the NIC's current setting. It could be a 1Gb NIC set to 100Mbs.

Also, in our case, the Linux server is an IBM xSeries 345 server. We had to do something special to get the 1Gb to work which right now I don't remember what it was. Still when we look at it with mii-tool we get:

# mii-tool -v eth0
eth0: negotiated 100baseTx-FD flow-control, link ok
product info: vendor 00:50:43, model 2 rev 3
basic mode: autonegotiation enabled
basic status: autonegotiation complete, link ok
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

Yes we're sure it is set to 1Gb because we've monitored the network transfer rates using sar and they've gone well over 10 MBs/sec.

Vic

Re: whats my nic speed?

rick jones — Fri, 05 Jan 2007 21:05:20 GMT

The other reporting tool to try would be ethtool...

Re: whats my nic speed?

Brendan Murphy_5 — Mon, 15 Jan 2007 06:13:37 GMT

Hi Guys,
I remember having problems using mii-tool on a SLES 9.2 system. The server had a GB card, but using mii-tool we could not set 1GB, nor could we get valid output when querying a device the autoneg'd 1GB. The man pages for mii-tool only specify upto 100MB. I suspect this tool doesn't know about GB cards. I'd recommend using ethtool. All our problems were resolved using this utility.

regards,

Brendan Murphy