netdev - stmmac: Performance regression after commit aff3d9eff843 "net: stmmac: enable multiple buffers"

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Date:   Thu, 23 Mar 2017 11:08:28 +0100
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     Joao.Pinto@...opsys.com, peppe.cavallaro@...com,
        alexandre.torgue@...com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: stmmac: Performance regression after commit aff3d9eff843 "net:
 stmmac: enable multiple buffers"

Hello

Using next-20170323 produce a huge performance regression on my sunxi boards.
On dwmac-sun8i, iperf goes from 94mbs/s to 37 when sending.

On cubieboard2(dwmac-sunxi), iperf made the kernel flood with "ndesc_get_rx_status: Oversized frame spanned multiple buffers"
and network is lost after.

Reverting aff3d9eff84399e433c4aca65a9bb236581bc082 fix the issue.
I still try to found which part of this patch mades the performance lower.

Regards
Corentin Labbe