From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter P Waskiewicz Jr Subject: Re: Getting physical packet counts with LRO enabled with ixgbe? Date: Wed, 23 Sep 2009 11:32:46 -0700 Message-ID: <1253730766.2538.28.camel@localhost.localdomain> References: <4ABA4F8B.6040504@candelatech.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: NetDev To: Ben Greear Return-path: Received: from mga02.intel.com ([134.134.136.20]:56552 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752709AbZIWScu (ORCPT ); Wed, 23 Sep 2009 14:32:50 -0400 In-Reply-To: <4ABA4F8B.6040504@candelatech.com> Sender: netdev-owner@vger.kernel.org List-ID: On Wed, 2009-09-23 at 09:40 -0700, Ben Greear wrote: > I notice that with LRO enabled, the interface stats count the LRO'd pkts, > not the physical ones on the wire. > > I also tried using ethtool -S, but it seems those counters are the same. > > Is there any way to get the actual rx/tx packet count on the wire? > Depending on which device you're using ixgbe with, there are slightly different registers to get what you want. The only suggestion I have for you though is to refer to the datasheets for each device on our SourceForge site (e1000.sf.net). Some of the relevant counters to look at are PRC64, PRC127, etc, and GPRC/GPTC. For the per-queue stuff, you'll need to look at the TQSMR and RQSMR mapping registers. Let me know if you need assistance in using these registers. > Also, for the rx/tx bytes, I assume that isn't counting the protocol headers > for the physical pkts that have been merged into a single LRO packet. Is > there any way to get the wire stats for bytes as well? The counters for per-byte are purely software-based, so if the packet is LRO'd, you can probably do some somewhat trivial math with the MTU to find the actual wire stats. But we only compute what we pass to the stack, so it'd be the LRO'd packet. Cheers, -PJ Waskiewicz