Re: [gentoo-server] 1000Mbps NIC Getting 100Mbps speeds

[Chris T. Purcell]

On Fri, 22 Apr 2005 09:42:28 -0400
fire-eyes <sgtphou@×××××××××.org> wrote:

> I have installed a 1000Mbps NIC in my system. This is the system some of
> you read about me where I was trying to swap the names of eth0 and eth1
> so maybe that has something to do with my problem.
>
> The light on the NIC shows 1000Mbps link, as does the switch it is
> connected to. Kernel messages show the link as autonegotiated, and
> 1000Mbps.
>
> The only odd one out is mii-tool which claims "eth0: negotiated
> 100baseTx-FD, link ok"
>
> I also tried using ethtool to set it at 1000Mbps anyway via ethtool -s
> eth0 speed 1000 , and the kernel again spits out messages about a
> 1000Mbps link being up just fine. mii-tool still says the same as above,
> however.
>
> The problem is that I get speeds just as if it were a 100Mbps link,
> starting at about 9MB/s then dropping to about 8.
>
> As noted above I had two NIC's. One was an onboard 100Mbps, and the
> second an add on 64-bit 1000Mbps. I had to do some tweaking with nameif
> to get the 1000Mbps as eth0, and the 100Mbps as eth1. The reasons why I
> wanted this really don't matter.
>
> Making things more confusing, last night when I first applied the nameif
> changes, I DID see 1000Mbps speed transfers.
>
> I saw exactly this behavior in the past, what was happening was the
> traffic was going right back out the 100Mbps and thus we had 100Mbps
> speeds. However this time I've disabled the 100Mbps, even unplugged it.
>
> There are no unusual routing entries. I am not using iptables.
>
> I'm stumped here, any ideas?
>
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> gentoo-server@g.o mailing list
>
mii-tool does not report anything higher than 100Mbps. That's your problem. Wrong tool for the job.
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