From mboxrd@z Thu Jan 1 00:00:00 1970 From: Francois Romieu Subject: Re: r8169 & TX offload Date: Tue, 16 Oct 2007 19:25:17 +0200 Message-ID: <20071016172517.GA8120@electric-eye.fr.zoreil.com> References: <4714D785.3000402@vlnb.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: LKML , netdev@vger.kernel.org To: Vladislav Bolkhovitin Return-path: Received: from electric-eye.fr.zoreil.com ([213.41.134.224]:42935 "EHLO electric-eye.fr.zoreil.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759311AbXJPR2l (ORCPT ); Tue, 16 Oct 2007 13:28:41 -0400 Content-Disposition: inline In-Reply-To: <4714D785.3000402@vlnb.net> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org (please remove l-k from the Cc:, this ought to be sent to netdev) Vladislav Bolkhovitin : > > I've recently bought Realtek RTL8169S-32 chip based Gigabit Ethernet card: > > # lspci -vv [...] > I've noticed that all TX offload features (tx-checksumming, > scatter-gather and TSO) are disabled by default and should be manually > enabled by ethtool. I wonder, is there any particular reason for that? As far as I can tell, it is mostly a lack of pressure from the users and my desire to avoid a change of behavior. > Why they are not enabled by default as it was done for e1000 or tg3? Are > there any hidden drawbacks in enabling them? None that I know of. I had not noticed a huge difference and people did not comment a lot either... > Those offload options are definitely work. They give in my setup (32-bit > 66MHz PCI, Xeon 1.7GHz CPU, open-iscsi) CPU offload from 75% to 45% and > data write throughput improvement from 55MB/s to 59MB/s. ...but your datapoint is welcome. -- Ueimor