em interface slow down on 8.0R

[Nick Rogers]

Can anyone clarify if I should be looking to disable TSO or TXCSUM, or both,
or does disabling either one somehow work around the problem? Thanks a lot.

On Mon, Jan 25, 2010 at 8:31 PM, Joshua Boyd <boydjd at jbip.net> wrote:

> I've been having a similar problem with my network dropping completely on
> my
> 8-STABLE gateway/firewall/fileserver. My setup is a little different, as I
> have re0 and ral0 bridged for LAN, and em0 for WAN. I've just turned off TX
> checksum offloading to see if that makes any difference.
>
> On Mon, Jan 25, 2010 at 1:49 PM, Lars Eggert <lars.eggert at nokia.com>
> wrote:
>
> > Hi,
> >
> > On 2010-1-25, at 19:38, Nick Rogers wrote:
> > >> On Mon, Jan 25, 2010 at 10:22 AM, Pyun YongHyeon <pyunyh at gmail.com>
> > wrote:
> > >> I'm not sure you're seeing a checksum offload bug of em(4) but the
> > >> bug is easily reproducible in VLAN environments. If the issue is
> > >> gone when you disable TX checksum offloading, see kern/141843 for
> > >> for more detailed information as well as fix.
> > >>
> > > Good to know, but I am having a similar problem on another em(4)
> > interface that has no VLAN interfaces.
> >
> > FYI, I also have these issues without using VLANs, and turning off TSO
> > fixed them.
> >
> > Lars
>