[dpdk-dev] About : Enable optional dequeue zero copy for vHost User

[Loftus, Ciara]

Hi,

For the meantime this feature is proposed as ‘experimental’ for OVS DPDK.
Unless you are transmitting to a NIC, you don’t need to set the n_txq_desc.
My testing has been only with a DPDK driver in the guest. Have you tried that option?

Thanks,
Ciara

From: liyang07 [mailto:liyang07 at corp.netease.com]
Sent: Wednesday, January 17, 2018 10:41 AM
To: Loftus, Ciara <ciara.loftus at intel.com>
Cc: dev at dpdk.org
Subject: About : Enable optional dequeue zero copy for vHost User


Hi Ciara,

    I am tesing the function of "vHost dequeue zero copy" for vm2vm on a host, and I have some problems:

    1. The networking is OK before run iperf, I can ping successed from vm1 to vm2，but after run iperf, the networking between vm1 and vm2 is down;(I think n_txq_desc cause the problem)

    2. I know the limitation about n_txq_desc, but I cannot set the n_txq_desc for dpdkport while the vms on the same host, because there is no dpdkports work fow my testing;



    Thus, how can I resolve it, thanks.