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

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Date:   Wed, 7 Sep 2016 20:07:01 +0300
From:   Saeed Mahameed <saeedm@....mellanox.co.il>
To:     Tom Herbert <tom@...bertland.com>
Cc:     Or Gerlitz <gerlitz.or@...il.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Rana Shahout <ranas@...lanox.com>,
        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>,
        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 7:54 PM, Tom Herbert <tom@...bertland.com> wrote:
> On Wed, Sep 7, 2016 at 7:48 AM, Saeed Mahameed
> <saeedm@....mellanox.co.il> wrote:
>> On Wed, Sep 7, 2016 at 4:32 PM, Or Gerlitz <gerlitz.or@...il.com> wrote:
>>> 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?
>>
>> Yes, I will make this more clear in the actual submission,
>> Here we are talking about different RSS core rings.
>>
>>>
>>> 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 we did, the first row is what you are describing the other rows
>> are the same test
>> with increasing the number of the RSS receiving cores, The xmit side is sending
>> as many streams as possible to be as much uniformly spread as possible
>> across the
>> different RSS cores on the receiver.
>>
> Hi Saeed,
>
> Please report CPU utilization also. The expectation is that
> performance should scale linearly with increasing number of CPUs (i.e.
> pps/CPU_utilization should be constant).
>

Hi Tom

That was my expectation too.

We didn't do the full analysis yet, It could be that RSS was not
spreading the workload on all the cores evenly.
Those numbers are from my humble machine with a quick and dirty
testing, the idea of this submission
is to let the folks look at the code while we continue testing and
analyzing those patches.

Anyway we will share more accurate results when we have them, with CPU
utilization statistics as well.

Thanks,
Saeed.

> Tom
>