Re: [dpdk-users] Round-robin instead of RSS

["Dorsett, Michal" <Michal.Dorsett@verint.com>]

I think my wording was not clear enough:

Every packet that enters through the device will be delayed by our application for 1 second.
Given 10Gbps worth of traffic, for example, at an average packet size of 600 bytes, this is roughly 2M packets per second.

A 710-series NIC makes use of 1M mbufs in a queue at the very most. In order for us to delay 2M packets, we need to create several queues per NIC.
I understand RSS is in the hardware, but hardware can be programmed, too, and hopefully turned off - and that's my question - whether, in addition to the RSS there is a round-robin policy that can be configured.

Thanks,

Michal

-----Original Message-----
From: Stephen Hemminger [mailto:stephen@networkplumber.org]
Sent: Wednesday, December 06, 2017 12:35 AM
To: Dorsett, Michal <Michal.Dorsett@verint.com>
Cc: users@dpdk.org; Maimon, Royi <Royi.Maimon@verint.com>
Subject: Re: [dpdk-users] Round-robin instead of RSS

On Tue, 5 Dec 2017 21:23:23 +0000
"Dorsett, Michal" <Michal.Dorsett@verint.com> wrote:

> We are using an XL710 nic 4x10Gbps.
> Our application needs to delay all packets in the system for at least the first second, and depending on the type of traffic mbufs may need to delay packets even more.
>
> Since the XL710 makes use of, at most, 1M mbufs in a queue and not more - we need to create several queues that provide enough mbufs for the nic not to starve.
>
> Because we handle extremely varied traffic, we may not be able to statically configure an RSS to load balance traffic evenly between the queues.
>
> Is it possible to set up a round-robin policy between the queues instead of RSS?
> I realize the drawbacks - un-orderliness, etc. - but please assume we have our methods of handling those specific issues.
>
> Thanks,
>
> Michal Dorsett
> Developer, Strategic IP Group
> Desk: +972 962 4350
> Mobile: +972 50 771 6689
> Verint Cyber Intelligence
> www.verint.com<http://www.verint.com/>

I don't work for Intel team and don't have XL710. But although XL710 may have limited hardware queue depth, there is no requirement that you give all the mbuf's directly to XL710 at once. If you have to hold off traffic, then just don't pass it to the device.

RSS is built in the hardware.


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