em0 NIC slow on 8.2-p1 amd64?

Michael W. Lucas mwlucas at blackhelicopters.org
Wed Jul 20 19:16:43 UTC 2011

On Wed, Jul 20, 2011 at 07:12:27PM +0200, Eduardo Morras wrote:
> At 18:04 20/07/2011, Michael W. Lucas wrote:
> >Hi,
> >
> >I'm running FreeNAS 8.0/amd64, with an 8.2-p1 kernel.  When using FTP
> >or SCP, performance maxes out around 30MB/s. This is on a gigabit
> >network, no errors showing.
> >
> >It looks a lot like kern/152828, but it seems that nobody's looking at
> >that.
> Don't know about that, but perhaps the nic is not working at full gigabit.
> Can you post the output of ifconfig?
> #ifconfig em0

It's at gigabit:

em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:15:17:31:c8:fe
        inet xxxxxxx
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active


> If it's not connected at 1 gigabit or not full duplex you can force 
> it with ifconfig. If there are too much errors check the cable.
> >As per suggestions from the archives, I've tried disabling TSO. No
> >change.
> >
> >Anyone else experiencing this, or have any suggestions? At the moment,
> >the boss is complaining that his Windows Home Server is doing better
> >than this machine, and that's a technological direction I really don't
> >want to go in.
> >
> >Thanks,
> >==ml

Michael W. Lucas 	
http://www.MichaelWLucas.com/, http://blather.MichaelWLucas.com/
Latest book: Network Flow Analysis http://www.networkflowanalysis.com/
mwlucas at BlackHelicopters.org, Twitter @mwlauthor

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