doc: improve vhost zero copy guide

Highlight that vhost zero copy mbufs should be consumed
as soon as possible.

Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Tiwei Bie 2019-02-22 10:42:09 +08:00 committed by Ferruh Yigit
parent 2a2904fa9c
commit 5c6c1480b3

@ -92,6 +92,9 @@ The following is an overview of some key Vhost API functions:
to use vfio-pci driver, please insert vfio-pci kernel module in noiommu
mode.
* The consumer of zero copy mbufs should consume these mbufs as soon as
possible, otherwise it may block the operations in vhost.
- ``RTE_VHOST_USER_IOMMU_SUPPORT``
IOMMU support will be enabled when this flag is set. It is disabled by