Hi Jesse, The issue persists in all kernels on the 2.6 branch. I've not experienced it with 3.x kernels but my scripts have disabled TX checksumming since I first came across the issue.
The problem is that many people run VMs to support "legacy" systems on new high-capacity hardware or in production environments where we are compelled to run say RHEL which doesn't ship with a kernel newer than 2.6.35. So while this isn't an issue with OVS it probably should be prominently mentioned somewhere in your doco if only to avoid it appearing in list posts over and over. A fix belongs in Xen's netfront driver I think. I have assumed Hans is using Xen. Dave On 06/01/2012, at 12:22 PM, Jesse Gross wrote: > On Thu, Jan 5, 2012 at 3:15 AM, Hans van Kranenburg > <[email protected]> wrote: >> On 01/05/2012 04:04 AM, Jesse Gross wrote: >>> >>> On Wed, Jan 4, 2012 at 8:32 AM, Hans van Kranenburg >>> <[email protected]> wrote: >>>> >>>> Any idea? >>>> >>>> delta.mgt.kantoor.mendix.nl:~ 0-# ethtool -k eth0 >>>> Offload parameters for eth0: >>>> rx-checksumming: on >>>> tx-checksumming: on >>>> scatter-gather: on >>>> tcp-segmentation-offload: off >>>> udp-fragmentation-offload: off >>>> generic-segmentation-offload: on >>>> generic-receive-offload: on >>>> large-receive-offload: off >>>> ntuple-filters: off >>>> receive-hashing: off >>> >>> >>> What happens if you turn off tx checksum offloading on the interfaces >>> with IP addresses assigned to them? >> >> >> Yay! Knowing this, and looking at the list archives again... it seems to be >> a rather common issue. > > I'm guessing that it's the combination of offloading, vlans, and your > driver/kernel version so if you can move to a new kernel (like 3.1) > that may solve the issue. > _______________________________________________ > discuss mailing list > [email protected] > http://openvswitch.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list [email protected] http://openvswitch.org/mailman/listinfo/discuss
