CentOS - Nov 2009 - 3Com 3c940 moel only giving me 100 mb throughput to network switch

Hello all,

As the subject states, I have a 3Com 3c940 Ethernet card to a 1 gb network 
switch. The switch detects it, but it only shows that it is giving me 100 
mb/sec throughput. That card is rated for 1 GB...is there a way to force 
it to try to use 1 GB/sec? System-config-network isn't helping me here.

Thanks for any help!

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Gilbert Sebenste                                                     ********
(My opinions only!)                                                  ******
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Gilbert Sebenste wrote:
> Hello all,
> 
> As the subject states, I have a 3Com 3c940 Ethernet card to a 1 gb network 
> switch. The switch detects it, but it only shows that it is giving me 100 
> mb/sec throughput. That card is rated for 1 GB...is there a way to force 
> it to try to use 1 GB/sec? System-config-network isn't helping me here.
Check using ethtool that it is really connected with 1GB. Anyway, lot of 
stuff like harddisk affects speed of line.

You need enought fast harddisks (possibly with raid) to saturate full 
1GB line .. on both ends..

--
Eero

Gilbert Sebenste wrote:
> Hello all,
> 
> As the subject states, I have a 3Com 3c940 Ethernet card to a 1 gb network 
> switch. The switch detects it, but it only shows that it is giving me 100 
> mb/sec throughput. That card is rated for 1 GB...is there a way to force 
> it to try to use 1 GB/sec? System-config-network isn't helping me here.
Does ethtool say it is running at 1Gb?  What is the source of the data? 
  Many things can't generate much more than 100Mb, especially going too 
or from a disk.

-- 
   Les Mikesell
    lesmikesell at gmail.com

Gilbert Sebenste wrote:
> Hello all,
>
> As the subject states, I have a 3Com 3c940 Ethernet card to a 1 gb network
> switch. The switch detects it, but it only shows that it is giving me 100
> mb/sec throughput. That card is rated for 1 GB...is there a way to force
> it to try to use 1 GB/sec? System-config-network isn't helping me here.
>
What kind of switch? many/most? NICs will often set the speed to 100
or 10Mbps if they can't auto negotiate the connection

Check the switch config to make sure that it's not trying to force
the connection to some lower speed.

nate