[ovs-dev] OVS DPDK support technical direction

[John Xiao]

Thanks Kevin,

There is a librte_vhost dir in upstream DPDK repo, would that be the
base of DPDK vhost library you are talking about? BTW, could you help
to elaborate what would be exactly included in the library?

John

On Fri, Dec 19, 2014 at 11:53 PM, Traynor, Kevin
<kevin.traynor at intel.com> wrote:
>
>> -----Original Message-----
>> From: John Xiao [mailto:johnxiao.cloud at gmail.com]
>> Sent: Thursday, December 18, 2014 2:46 PM
>> To: Traynor, Kevin
>> Subject: Re: [ovs-dev] OVS DPDK support technical direction
>>
>> Hi Kevin,
>>
>> The performance number looks great!
>> - For DPDK OVS, the number only shows NIC - OVS - NIC as vhost-user is
>> not supported yet, do you know what's the schedule for vhost-user
>> support?
>
> Assuming you do mean vhost-user (and not userspace-vhost aka vhost-cuse), it is planned to be integrated into the DPDK vhost library in DPDK 2.0, which is targeted for the end of March. At that point we can look at upgrading OVS to support DPDK 2.0 and being able to use the DPDK vhost library for vhost-user.
>
>> - On slide #8, it's interesting to see TCP_STREAM degrade quite a lot
>> in offload case.
>>
>> Thanks,
>> Jun
>>
>> On Thu, Dec 18, 2014 at 9:32 PM, Traynor, Kevin <kevin.traynor at intel.com> wrote:
>> > Hi John,
>> >
>> > The path using DPDK through the netdev can use the exact match cache in dpif-netdev.c to enable very
>> fast switching. You could think of this as an equivalent to the fast path in OVDK. Have a look at the
>> rates that Madhu Challa presented at the OVS Fall Conference on Slide 3
>> http://openvswitch.org/support/ovscon2014/18/1600-ovs_perf.pptx
>> >
>> > Thanks,
>> > Kevin.
>> >
>> >> -----Original Message-----
>> >> From: dev [mailto:dev-bounces at openvswitch.org] On Behalf Of John Xiao
>> >> Sent: Wednesday, December 17, 2014 4:10 AM
>> >> To: dev at openvswitch.org
>> >> Subject: [ovs-dev] OVS DPDK support technical direction
>> >>
>> >> Hi,
>> >>
>> >> As we know that Intel stopped its effort on OVDK and OVS DPDK support
>> >> will all be in OVS upstream, and I have one question after digging
>> >> OVDK and OVS DPDK architecture:
>> >>
>> >> - IMHO, OVS DPDK support can follow the existing "fast/slow path"
>> >> model as being done in OVS linux kernel, i.e. just another fast path
>> >> happening in DPDK threads, and this is pretty much the mechanism used
>> >> by OVDK by extending a new kind of dpif provider. But for upstream OVS
>> >> DPDK support, I can only see netdev extension, I don't know what's the
>> >> reason behind, can anybody post any discussion relevant on this if
>> >> any? Do we see huge benefit when every packet going through "netdev"
>> >> type of data path instead of a fast/slow path fashion? or I missed
>> >> anything obvious?
>> >>
>> >> Thanks,
>> >> John
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