On Mon, Jan 25, 2010 at 08:25:43AM -0800, Nick Rogers wrote: > 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'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. > 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.egg...@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 > > > > _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
