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  #1  
Old 20th March 2008, 08:34 PM
tronic Offline
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Join Date: Sep 2005
Posts: 143
gigabit nic not connecting at full speed

i have a on board RTL8111/8168B nic:

Code:
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)
and it doesn't seem to connect at 1000Mb/s, its connected to a gigabit switch whick works fine, and i know the onboard is fine, because in windows, it syncs up at 1000M/bs.

ethtool shows:

Code:
[root@localhost lylem]# /sbin/ethtool eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000033 (51)
        Link detected: yes
i tried changing the speed my self, but it just syncs back up to 100

Code:
[root@localhost lylem]# /sbin/ethtool -s eth0 speed 1000 duplex full autoneg on
any ideas? im at a loss.
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  #2  
Old 20th March 2008, 09:40 PM
sej7278 Offline
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Posts: 2,008
ethtool is broken when it comes to anything from realtek it seems - my 8169 negotiaties gigabit according to my switches (and an intel nic in a laptop using crossover cable) and transfer rate, but ethtool reports 100mbps, ethtool -s has no effect.
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  #3  
Old 20th March 2008, 09:45 PM
tronic Offline
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Join Date: Sep 2005
Posts: 143
hmm... well either way, the switch indicates its connected at 100 aswell, must just be something with the driver?
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  #4  
Old 20th March 2008, 09:52 PM
Nokia Offline
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What happens if you change it to autoneg off ?
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  #5  
Old 20th March 2008, 10:12 PM
tronic Offline
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Join Date: Sep 2005
Posts: 143
no go on that one. it doesn't come back if i turn it off. also i checked the cable to make sure its able to connect at those speeds.
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