netdev - Re: [PATCH RFC 08/11] net/mlx5e: XDP fast RX drop bpf programs support

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Date:   Wed, 7 Sep 2016 16:32:52 +0300
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     Saeed Mahameed <saeedm@...lanox.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Rana Shahout <ranas@...lanox.com>
Cc:     iovisor-dev <iovisor-dev@...ts.iovisor.org>,
        Linux Netdev List <netdev@...r.kernel.org>,
        Brenden Blanco <bblanco@...mgrid.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Tom Herbert <tom@...bertland.com>,
        Martin KaFai Lau <kafai@...com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: [PATCH RFC 08/11] net/mlx5e: XDP fast RX drop bpf programs support

On Wed, Sep 7, 2016 at 3:42 PM, Saeed Mahameed <saeedm@...lanox.com> wrote:

> Packet rate performance testing was done with pktgen 64B packets and on
> TX side and, TC drop action on RX side compared to XDP fast drop.
>
> CPU: Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz
>
> Comparison is done between:
>         1. Baseline, Before this patch with TC drop action
>         2. This patch with TC drop action
>         3. This patch with XDP RX fast drop
>
> Streams    Baseline(TC drop)    TC drop    XDP fast Drop
> --------------------------------------------------------------
> 1           5.51Mpps            5.14Mpps     13.5Mpps
> 2           11.5Mpps            10.0Mpps     25.1Mpps
> 4           16.3Mpps            17.2Mpps     35.4Mpps
> 8           29.6Mpps            28.2Mpps     45.8Mpps*
> 16          34.0Mpps            30.1Mpps     45.8Mpps*

Rana, Guys, congrat!!

When you say X streams, does each stream mapped by RSS to different RX ring?
or we're on the same RX ring for all rows of the above table?

In the CX3 work, we had X sender "streams" that all mapped to the same RX ring,
I don't think we went beyond one RX ring.

Here, I guess you want to 1st get an initial max for N pktgen TX
threads all sending
the same stream so you land on single RX ring, and then move to M * N pktgen TX
threads to max that further.

I don't see how the current Linux stack would be able to happily drive 34M PPS
(== allocate SKB, etc, you know...) on a single CPU, Jesper?

Or.