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

Re: [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@corp.netease.com]
Sent: Wednesday, January 17, 2018 10:41 AM
To: Loftus, Ciara <ciara.loftus@intel.com>
Cc: dev@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.

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

[Chen, Junjie J]

Hi
Which version of dpdk you are using? I have some fixes for dequeue zero copy and now in 18.02-rc1, you can try 18.02-r1.

Cheers
JJ

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Loftus, Ciara
> Sent: Tuesday, January 23, 2018 6:46 PM
> To: liyang07 <liyang07@corp.netease.com>
> Cc: dev@dpdk.org; dev@openvswitch.org
> Subject: Re: [dpdk-dev] About : Enable optional dequeue zero copy for vHost
> User
> 
> 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@corp.netease.com]
> Sent: Wednesday, January 17, 2018 10:41 AM
> To: Loftus, Ciara <ciara.loftus@intel.com>
> Cc: dev@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.
> 
> 
>