From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp3.clb.oleane.net (smtp3.clb.oleane.net [213.56.31.19]) by ozlabs.org (Postfix) with ESMTP id A9AFA67A58 for ; Wed, 15 Feb 2006 02:21:22 +1100 (EST) Received: from GEG2400 ([194.3.133.184]) (authenticated) by smtp3.clb.oleane.net with ESMTP id k1EFLFev027110 for ; Tue, 14 Feb 2006 16:21:20 +0100 From: "Laurent Lagrange" To: Subject: Gianfar is slower than fcc_enet on MPC8541 ??? Date: Tue, 14 Feb 2006 16:26:48 +0100 Message-ID: <000001c6317b$148162c0$5201a8c0@GEG2400> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" In-Reply-To: List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hello, I work on a cutom MPC8541 board with Linux 2.6.9. The kernel activates the L1 cache (instructions and data) and the L2 cache (entirely used as cache and not as sram). I configure 1 FCC (FCC1), 2 TSECs with or without NAPI (no effect) but without stashing in L2 sram. All PHYs are automatically configured in 100MB full duplex. eth0: Gianfar Ethernet Controller Version 1.1, 00:10:cd:48:48:e0 eth0: Running with NAPI disabled eth0: 64/64 RX/TX BD ring size eth1: Gianfar Ethernet Controller Version 1.1, 00:10:cd:48:48:e1 eth1: Running with NAPI disabled eth1: 64/64 RX/TX BD ring size eth2: FCC ENET Version custom, 00:10:cd:48:48:e2 Then I launch 3 simple TCP servers, one on each ports. >>From remote machines I runs 3 TCP clients. The client sends messages of 1000 bytes, The server receives and echoes the message The client receives the echoed message, check the content and sends a new message again. The result is that the 2 TSECs are 2 times slower than the FCC. If I run a "top" application on the board, I use less than 10% of the CPU Each port consumes about 1/3 of the CPU. Any idea on how to configure the gianfar driver ? Thanks Laurent