From mboxrd@z Thu Jan 1 00:00:00 1970 From: Corentin Labbe Subject: stmmac: Performance regression after commit aff3d9eff843 "net: stmmac: enable multiple buffers" Date: Thu, 23 Mar 2017 11:08:28 +0100 Message-ID: <20170323100828.GC16625@Red> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org To: Joao.Pinto@synopsys.com, peppe.cavallaro@st.com, alexandre.torgue@st.com Return-path: Received: from mail-wr0-f178.google.com ([209.85.128.178]:34261 "EHLO mail-wr0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751538AbdCWKIf (ORCPT ); Thu, 23 Mar 2017 06:08:35 -0400 Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: 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