[dpdk-dev] Having troubles binding an SR-IOV VF to uio_pci_generic on Amazon instance

Stephen Hemminger stephen at networkplumber.org
Thu Oct 1 16:55:20 CEST 2015


On Thu, 1 Oct 2015 13:14:08 +0300
"Michael S. Tsirkin" <mst at redhat.com> wrote:

> On Thu, Oct 01, 2015 at 12:43:53PM +0300, Avi Kivity wrote:
> > >There were some tentative to get it for other (older) drivers, named
> > >'bifurcated drivers', but it is stalled.
> > 
> > IIRC they still exposed the ring to userspace.
> 
> How much would a ring write syscall cost? 1-2 microseconds, isn't it?

The per-packet budget at 10G is 62ns, a syscall just doesn't cut it.


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