Regarding Netmap in VM

Luigi Rizzo rizzo at iet.unipi.it
Mon May 26 17:02:12 UTC 2014


On Thu, May 22, 2014 at 09:28:45AM +0530, Prashant Upadhyaya wrote:
> Hi,
> 
> Suppose I am on x86 with Intel 82599 NIC.
> Now I spawn a VM (running FreeBSD as guest OS with Netmap support)
> For better I/O performance, I have two main choices --
> 
> 1. Pass the 82599 NIC as a PCI passthrough device into the VM
> 2. Use SRIOV VF of 82599 into the VM
> 
> Question is, will Netmap be able to utilize both the above environments
> when I run the userspace application in the guest OS in the VM, or will
> there be any issues.

if i remember well we do not have sriov vf support yet in freebsd
so you should follow the pci-passthrough approach.

It should probably work, i am not 100% sure who is in charge of
programming the IOMMU for the guest os when accessing a device
through pci passthrough. If this part is missing, the symptoms
you should see is that packets will have all bytes set to 0x00

cheers
luigi


More information about the freebsd-net mailing list