Bug#561851: mii-tool reports the wrong speed
Russell Coker
russell at coker.com.au
Wed Aug 11 07:05:37 UTC 2010
# ethtool eth2|grep Speed
Speed: 100Mb/s
# mii-tool -v eth2
eth2: negotiated 1000baseT-HD flow-control, link ok
product info: Intel 82555 rev 0
basic mode: autonegotiation enabled
basic status: autonegotiation complete, link ok
capabilities: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD
10baseT-HD
advertising: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD
10baseT-HD flow-control
link partner: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD
10baseT-HD
The system on which I ran the above commands has no Gig-e ports. ethtool gets
the right answer (or at least something that seems plausible) while mii-tool
gets a bogus answer of 100baseT-HD. I've reproduced this problem with other
ports on the same system. It's a P3 desktop system running kernel linux-
image-2.6.32-5-686 version 2.6.32-18, net-tools version 1.60-23, and ethtool
2.6.34-2.
# mii-tool
eth0: no link
eth1: negotiated 1000baseT-HD flow-control, link ok
eth2: negotiated 1000baseT-HD flow-control, link ok
# ethtool eth1|grep Speed
Speed: 100Mb/s
# ethtool eth2|grep Speed
Speed: 100Mb/s
The system that I used to run the above commands was an AMD64 system but
otherwise had the same versions.
# mii-tool
eth0: negotiated 100baseTx-FD flow-control, link ok
eth1: no link
eth2: negotiated 1000baseT-HD flow-control, link ok
crombian:~# ethtool eth2 |grep Speed
Speed: 100Mb/s
The above commands were run on another AMD64 system with the same versions.
All three systems have the same Intel E100 dual-port Ethernet cards. The
cards were purchased second-hand from the same batch and had probably been in
the same batch when new.
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