From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752569AbbKKOoh (ORCPT ); Wed, 11 Nov 2015 09:44:37 -0500 Received: from mail-pa0-f48.google.com ([209.85.220.48]:34298 "EHLO mail-pa0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752098AbbKKOog (ORCPT ); Wed, 11 Nov 2015 09:44:36 -0500 Message-ID: <1447253074.17135.109.camel@edumazet-glaptop2.roam.corp.google.com> Subject: Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller From: Eric Dumazet To: =?ISO-8859-1?Q?M=E5ns_Rullg=E5rd?= Cc: David Miller , romieu@fr.zoreil.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, slash.tmp@free.fr Date: Wed, 11 Nov 2015 06:44:34 -0800 In-Reply-To: References: <1447172063-27234-1-git-send-email-mans@mansr.com> <20151110233448.GA8646@electric-eye.fr.zoreil.com> <20151110.211121.422193831316296487.davem@davemloft.net> <1447248595.17135.98.camel@edumazet-glaptop2.roam.corp.google.com> <1447250961.17135.104.camel@edumazet-glaptop2.roam.corp.google.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.4-0ubuntu2 Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2015-11-11 at 14:35 +0000, Måns Rullgård wrote: > It seems the on-chip interconnect is limiting memory bandwidth available > to the Ethernet DMA. If I increase the limits, I get 800 Mbps over TCP > and 850 Mbps over UDP with the driver posted here, the TCP case being > CPU bound in csum_partial_copy_from_user. Ah right, NIC has no TX checksum offload :(