[ovs-discuss] ovs-dpdk performance is not good

[Na Zhu]

Hi,

Can you tell me how to enable the mergeable feature in ovs?

BR

2015-07-17 11:04 GMT+08:00 Ouyang, Changchun <changchun.ouyang at intel.com>:

>
>
> 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 at gmail.com <zhunatuzi at 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 at intel.com>:
>
>
>
> *From:* discuss [mailto:discuss-bounces at openvswitch.org] *On Behalf Of *Na
> Zhu
> *Sent:* Monday, July 13, 2015 3:15 AM
> *To:* bugs at 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:
>
>
>
> [image: 内嵌图片 1]
>
>
>
> The result is that standard ovs performance is better. Throughput unit
> Mbps.
>
> [image: 内嵌图片 2]
>
>
>
> [image: 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)
>
>
>
>
>
>
>
>
>
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