From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: e1000 performance issue in 4 simultaneous links Date: Thu, 10 Jan 2008 17:28:30 -0800 (PST) Message-ID: <20080110.172830.16409182.davem@davemloft.net> References: <1199981839.8931.35.camel@cafe> <36D9DB17C6DE9E40B059440DB8D95F5204275B04@orsmsx418.amr.corp.intel.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: leitao@linux.vnet.ibm.com, netdev@vger.kernel.org To: jesse.brandeburg@intel.com Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:37650 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1756190AbYAKB2g (ORCPT ); Thu, 10 Jan 2008 20:28:36 -0500 In-Reply-To: <36D9DB17C6DE9E40B059440DB8D95F5204275B04@orsmsx418.amr.corp.intel.com> Sender: netdev-owner@vger.kernel.org List-ID: From: "Brandeburg, Jesse" Date: Thu, 10 Jan 2008 12:52:15 -0800 > I hope this explanation makes sense, but what it comes down to is that > combining hardware round robin balancing with NAPI is a BAD IDEA. Absolutely agreed on all counts. No IRQ balancing should be done at all for networking device interrupts, with zero exceptions. It destroys performance.