Re: [dpdk-dev] [ovs-discuss] ovs-dpdk performance is not good

Re: [dpdk-dev] [ovs-discuss] ovs-dpdk performance is not good

[Ouyang, Changchun]

On 7/16/2015 9:45 PM, Traynor, Kevin wrote:
>
> (re-adding the ovs-discuss list)
>
> This might be better on the dpdk dev mailing list. For the OVS part, 
> see this thread 
> http://openvswitch.org/pipermail/discuss/2015-July/018095.html
>
> Kevin.
>
> *From:*Na Zhu [mailto:zhunatuzi@gmail.com]
> *Sent:* Wednesday, July 15, 2015 6:16 AM
> *To:* Traynor, Kevin
> *Subject:* Re: [ovs-discuss] ovs-dpdk performance is not good
>
> Hi Kevin,
>
> The interface MTU is 1500, the TCP message size is 16384 and the UDP 
> message size is 65507.
>
> How to use DPDK virtio PMD?
>
in DPDK virtio PMD, it uses mergeable feature to support jumbo frame,
the mergeable feature need negotiate with vhost on the backend,
so if ovs enable the mergeable feature, and virtio can succeed in 
negotiating this feature,
then jumbo frame can be supported.

thanks
Changchun

> 2015-07-14 20:25 GMT+08:00 Traynor, Kevin <kevin.traynor@intel.com 
> <mailto:kevin.traynor@intel.com>>:
>
>     *From:*discuss [mailto:discuss-bounces@openvswitch.org
>     <mailto:discuss-bounces@openvswitch.org>] *On Behalf Of *Na Zhu
>     *Sent:* Monday, July 13, 2015 3:15 AM
>     *To:* bugs@openvswitch.org <mailto:bugs@openvswitch.org>
>     *Subject:* [ovs-discuss] ovs-dpdk performance is not good
>
>     Dear all,
>
>     I want to use ovs-dpdk to improve my nfv performance. But when i
>     compare the throughput between standard ovs and ovs-dpdk, the ovs
>     is better, does anyone know why?
>
>     I use netperf to test the throughput.
>
>     use vhost-net to test standard ovs.
>
>     use vhost-user to test ovs-dpdk.
>
>     My topology is as follow:
>
>     内嵌图片 1
>
>     The result is that standard ovs performance is better. Throughput
>     unit Mbps.
>
>     内嵌图片 2
>
>     内嵌图片 3
>
>     [kt] I would check your core affinitization to ensure that the
>     vswitchd
>
>     pmd is on a separate core to the vCPUs (set with
>     other_config:pmd-cpu-mask).
>
>     Also, this test is not using the DPDK vitrio PMD in the guest
>     which provides
>
>     performance gains.
>
>     What packet sizes are you using? you should see a greater gain
>     from DPDK
>
>     at lower packet sizes (i.e. more PPS)
>