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doc: fix a typo in prog guide

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Signed-off-by: Yong Wang <wang.yong19@zte.com.cn>
Acked-by: John McNamara <john.mcnamara@intel.com>
This commit is contained in:
Yong Wang 2016-12-19 07:14:38 -05:00 committed by Thomas Monjalon
parent 81c85700a1
commit 580f8e3682
1 changed files with 1 additions and 1 deletions
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2
doc/guides/prog_guide/vhost_lib.rst
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@ -95,7 +95,7 @@ The following is an overview of the Vhost API functions:
* for VM2NIC case, the ``nb_tx_desc`` has to be small enough: <= 64 if virtio
indirect feature is not enabled and <= 128 if it is enabled.
The is because when dequeue zero copy is enabled, guest Tx used vring will
This is because when dequeue zero copy is enabled, guest Tx used vring will
be updated only when corresponding mbuf is freed. Thus, the nb_tx_desc
has to be small enough so that the PMD driver will run out of available
Tx descriptors and free mbufs timely. Otherwise, guest Tx vring would be