On Mon, Jan 25, 2010 at 10:22 AM, Pyun YongHyeon <[email protected]> wrote:
> 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. > Good to know, but I am having a similar problem on another em(4) interface that has no VLAN interfaces. > > > 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 <[email protected]> > 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 > > > > > > > _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
