Messages in this thread | | | Date | Sat, 03 Apr 2010 19:32:33 +0300 | From | Avi Kivity <> | Subject | Re: [RFC][PATCH v2 0/3] Provide a zero-copy method on KVM virtio-net. |
| |
On 04/03/2010 02:51 AM, Sridhar Samudrala wrote: > On Fri, 2010-04-02 at 15:25 +0800, xiaohui.xin@intel.com wrote: > >> The idea is simple, just to pin the guest VM user space and then >> let host NIC driver has the chance to directly DMA to it. >> The patches are based on vhost-net backend driver. We add a device >> which provides proto_ops as sendmsg/recvmsg to vhost-net to >> send/recv directly to/from the NIC driver. KVM guest who use the >> vhost-net backend may bind any ethX interface in the host side to >> get copyless data transfer thru guest virtio-net frontend. >> > What is the advantage of this approach compared to PCI-passthrough > of the host NIC to the guest? >
swapping/ksm/etc independence from host hardware live migration
> Does this require pinning of the entire guest memory? Or only the > send/receive buffers? >
If done correctly, just the send/receive buffers.
-- Do not meddle in the internals of kernels, for they are subtle and quick to panic.
| |