From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422775AbWHAH6w (ORCPT ); Tue, 1 Aug 2006 03:58:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1422771AbWHAH6w (ORCPT ); Tue, 1 Aug 2006 03:58:52 -0400 Received: from dsl027-180-168.sfo1.dsl.speakeasy.net ([216.27.180.168]:19081 "EHLO sunset.davemloft.net") by vger.kernel.org with ESMTP id S1422769AbWHAH6v (ORCPT ); Tue, 1 Aug 2006 03:58:51 -0400 Date: Tue, 01 Aug 2006 00:58:09 -0700 (PDT) Message-Id: <20060801.005809.102616533.davem@davemloft.net> To: drepper@redhat.com Cc: herbert@gondor.apana.org.au, johnpol@2ka.mipt.ru, zach.brown@oracle.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [RFC 1/4] kevent: core files. From: David Miller In-Reply-To: <44CF0866.3000505@redhat.com> References: <20060731.035716.39159213.davem@davemloft.net> <20060731105943.GA26114@gondor.apana.org.au> <44CF0866.3000505@redhat.com> X-Mailer: Mew version 4.2 on Emacs 21.4 / 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 From: Ulrich Drepper Date: Tue, 01 Aug 2006 00:53:10 -0700 > This is the case to keep in mind here. I thought Zach and the other > involved in the discussions in Ottawa said this has been shown to be a > problem and that a ring buffer implementation with something other than > simple front and back pointers is preferable. This is part of why I suggested VJ style channel data structure. At worst, the cachelines for the entries get into shared modified state when the remove userland cpu reads the slot.