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Date:   Sun, 26 Mar 2017 11:16:38 +0200
From:   Saeed Mahameed <>
To:     Tom Herbert <>
Cc:     Saeed Mahameed <>,
        "David S. Miller" <>,
        Linux Kernel Network Developers <>,
        Kernel Team <>
Subject: Re: [PATCH net-next 00/12] Mellanox mlx5e XDP performance optimization

On Sat, Mar 25, 2017 at 6:54 PM, Tom Herbert <> wrote:
> On Fri, Mar 24, 2017 at 2:52 PM, Saeed Mahameed <> wrote:
>> Hi Dave,
>> This series provides some preformancee optimizations for mlx5e
>> driver, especially for XDP TX flows.
>> 1st patch is a simple change of rmb to dma_rmb in CQE fetch routine
>> which shows a huge gain for both RX and TX packet rates.
>> 2nd patch removes write combining logic from the driver TX handler
>> and simplifies the TX logic while improving TX CPU utilization.
>> All other patches combined provide some refactoring to the driver TX
>> flows to allow some significant XDP TX improvements.
>> More details and performance numbers per patch can be found in each patch
>> commit message compared to the preceding patch.
>> Overall performance improvemnets
>>   System: Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz
>> Test case                   Baseline      Now      improvement
>> ---------------------------------------------------------------
>> TX packets (24 threads)     45Mpps        54Mpps      20%
>> TC stack Drop (1 core)      3.45Mpps      3.6Mpps     5%
>> XDP Drop      (1 core)      14Mpps        16.9Mpps    20%
>> XDP TX        (1 core)      10.4Mpps      13.7Mpps    31%
> Awesome, and good timing. I'll be presenting XDP at IETF next and
> would like to include these numbers in the presentation if you don't
> mind...

Not at all, please go ahead.

But as you see, the system i tested on is not that powerful. We can
get even better results with a modern system.
If you want i can provide you those numbers by mid-week.

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