From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756383AbYHKVu5 (ORCPT ); Mon, 11 Aug 2008 17:50:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752906AbYHKVur (ORCPT ); Mon, 11 Aug 2008 17:50:47 -0400 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:57223 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752122AbYHKVuq (ORCPT ); Mon, 11 Aug 2008 17:50:46 -0400 Date: Mon, 11 Aug 2008 14:50:47 -0700 (PDT) Message-Id: <20080811.145047.105665450.davem@davemloft.net> To: cl@linux-foundation.org Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: tbench regression on each kernel release from 2.6.22 -> 2.6.28 From: David Miller In-Reply-To: <48A0B037.501@linux-foundation.org> References: <48A086B6.2000901@linux-foundation.org> <20080811.141501.01468546.davem@davemloft.net> <48A0B037.501@linux-foundation.org> X-Mailer: Mew version 5.2 on Emacs 22.1 / 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 List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christoph Lameter Date: Mon, 11 Aug 2008 16:33:43 -0500 > Maybe what we are seeing is general bloat in kernel execution paths > due to the growth in complexity? It could be, and any kind of analysis into this would be great. I had a change that RCU destroyed sockets and this added a tiny bit of latency, so I never added it even though it would have allowed a lot of simplification of socket handling (which I though would make up for RCU's latency, but it didn't).