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

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Date:   Thu, 23 Dec 2021 14:18:03 +0100
From:   Íñigo Huguet <ihuguet@...hat.com>
To:     habetsm.xilinx@...il.com
Cc:     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 Martin,

I replied this a few weeks ago, but it seems that, for some reason, I
didn't CCd you.

On Thu, Dec 9, 2021 at 1:06 PM Íñigo Huguet <ihuguet@...hat.com> wrote:
>
> 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



-- 
Íñigo Huguet