
Issue 11
© Solarflare Communications 2014
323
Solarflare Server Adapter
User Guide
Known Issues
• Some hardware platforms are unable to support 127 VFs on both ports simultaneously. The
current workaround is to reduce the number of VFs exposed by the adapter using “sfboot”.
• When a Redhat Enterprise Linux 6 guest is migrated, occasionally the guest kernel fails to notice
either the VF unplug before migration or the VF hotplug after migration. This issue is believed to
be a Redhat kernel bug and is under investigation.
• Reloading the sfc driver while VFs are in use will result in a kernel panic. This is an upstream
kernel bug that Solarflare are working to address.
• There is a known issue when using LRO with macvtap interfaces. This issue can be worked
around by disabling LRO on the host machine. This issue does not affect the SRIOV accelerated
datapath.
• There is a known issue whereby the user tries to PXE boot one KVM guest off another KVM
guest, on the same host, over a macvtap interface the client does not receive the tftp packets
sent by the server and the connection times out. Solarflare are following up this issue with
RedHat. A workaround for this issue is disabling tx-checksumming on the PXE server VM.