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Date: Thu, 23 Mar 2017 10:12:18 +0000 From: Joao Pinto <Joao.Pinto@...opsys.com> To: Corentin Labbe <clabbe.montjoie@...il.com>, <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: Re: stmmac: Performance regression after commit aff3d9eff843 "net: stmmac: enable multiple buffers" Hi Corentin, Às 10:08 AM de 3/23/2017, Corentin Labbe escreveu: > 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 > I have a 4.21 QoS Core with 4 RX + 4 TX and detected no regression. Could you please share the iperf cmds you are using in order for me to reproduce in my side? @stmmac users: It would be great if people that have a setup could also perform teh same iperf test in order to clean in up for everyone. Thanks, Joao
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