netdev - Re: Bad performance in RX with sfc 40G

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Message-ID: <CACT4oufpvQ1Qzg3eC6wDu33_xBo5tVghr9G7Q=d-7F=bZbW4Vg@mail.gmail.com>
Date:   Thu, 9 Dec 2021 13:06:45 +0100
From:   Íñigo Huguet <ihuguet@...hat.com>
To:     Íñigo Huguet <ihuguet@...hat.com>,
        Edward Cree <ecree.xilinx@...il.com>, netdev@...r.kernel.org,
        Dinan Gunawardena <dinang@...inx.com>
Subject: Re: Bad performance in RX with sfc 40G

Hi,

On Sat, Nov 20, 2021 at 9:31 AM Martin Habets <habetsm.xilinx@...il.com> wrote:
> If you're testing without the IOMMU enabled I suspect the recycle ring
> size may be too small. Can your try the patch below?

Sorry for the very late reply, but I've had to be out of work for many days.

This patch has improved the performance a lot, reaching the same
30Gbps than in TX. However, it seems sometimes a bit erratic, still
dropping to 15Gbps sometimes, specially after module remove & probe,
or from one iperf call to another. But not being all the times, I
didn't found a clear pattern. Anyway, it clearly improves things.

Can this patch be applied as is or it's just a test?

--
Íñigo Huguet