Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 17 Sep 2002 21:04:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 17 Sep 2002 21:04:20 -0400 Received: from pizda.ninka.net ([216.101.162.242]:31109 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id ; Tue, 17 Sep 2002 21:04:20 -0400 Date: Tue, 17 Sep 2002 18:00:14 -0700 (PDT) Message-Id: <20020917.180014.07882539.davem@redhat.com> To: hadi@cyberus.ca Cc: akpm@digeo.com, manfred@colorfullife.com, netdev@oss.sgi.com, linux-kernel@vger.kernel.org Subject: Re: Info: NAPI performance at "low" loads From: "David S. Miller" In-Reply-To: References: <3D87A59C.410FFE3E@digeo.com> X-Mailer: Mew version 2.1 on Emacs 21.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 701 Lines: 16 From: jamal Date: Tue, 17 Sep 2002 20:57:58 -0400 (EDT) I am not so sure with that 6% difference there is no other bug lurking there; 6% seems too large for an extra two PCI transactions per packet. {in,out}{b,w,l}() operations have a fixed timing, therefore his results doesn't sound that far off. It is also one of the reasons I suspect Andrew saw such bad results with 3c59x, but probably that is not the only reason. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/