From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [net-next-2.6 PATCH 1/2] ixgbe: enable extremely low latency Date: Tue, 27 Apr 2010 12:56:00 -0700 (PDT) Message-ID: <20100427.125600.184829198.davem@davemloft.net> References: <20100427113651.24431.9221.stgit@localhost.localdomain> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, gospo@redhat.com, jesse.brandeburg@intel.com To: jeffrey.t.kirsher@intel.com Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:49596 "EHLO sunset.davemloft.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756777Ab0D0Tzy (ORCPT ); Tue, 27 Apr 2010 15:55:54 -0400 In-Reply-To: <20100427113651.24431.9221.stgit@localhost.localdomain> Sender: netdev-owner@vger.kernel.org List-ID: From: Jeff Kirsher Date: Tue, 27 Apr 2010 04:37:20 -0700 > From: Jesse Brandeburg > > 82598/82599 can support EITR == 0, which allows for the > absolutely lowest latency setting in the hardware. This disables > writeback batching and anything else that relies upon a delayed > interrupt. This patch enables the feature of "override" when a > user sets rx-usecs to zero, the driver will respect that setting > over using RSC, and automatically disable RSC. If rx-usecs is > used to set the EITR value to 0, then the driver should disable > LRO (aka RSC) internally until EITR is set to non-zero again. > > Signed-off-by: Jesse Brandeburg > Signed-off-by: Jeff Kirsher Applied.