em interface slow down on 8.0R

Nick Rogers ncrogers at gmail.com
Mon Jan 25 16:25:44 UTC 2010

I have not tried toying with any tcp sysctl. I'm not having performance
problems so much as the interface just stops working entirely, which I would
think has nothing to do with the TCP stack when layer 2 is not functioning?

I'll give it a shot if I can. For the moment I have had to switch to a
different (lower performance) network card to get things stable and I would
like to be aware of a more concrete driver fix in STABLE before switching
back my production machines.

On Mon, Jan 25, 2010 at 6:25 AM, Lars Eggert <lars.eggert at nokia.com> wrote:

> Hi,
> have you tried turning off TCP Segmentation Offloading (net.inet.tcp.tso
> sysctl)? That fixed performance issues with some em cards for me.
> Lars

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