From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753649Ab3CCTV4 (ORCPT ); Sun, 3 Mar 2013 14:21:56 -0500 Received: from two.firstfloor.org ([193.170.194.197]:34132 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753336Ab3CCTVz (ORCPT ); Sun, 3 Mar 2013 14:21:55 -0500 Date: Sun, 3 Mar 2013 20:21:53 +0100 From: Andi Kleen To: Eric Dumazet Cc: Eliezer Tamir , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Dave Miller , Jesse Brandeburg , e1000-devel@lists.sourceforge.net, Willem de Bruijn , Andi Kleen , HPA , Eliezer Tamir Subject: Re: [RFC PATCH 1/5] net: implement support for low latency socket polling Message-ID: <20130303192153.GC3401@two.firstfloor.org> References: <20130227175549.10611.82188.stgit@gitlad.jf.intel.com> <20130227175555.10611.42794.stgit@gitlad.jf.intel.com> <1362335704.15793.81.camel@edumazet-glaptop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1362335704.15793.81.camel@edumazet-glaptop> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Alternative to 2) would be to use a generation id, incremented every > time a napi used in spin polling enabled driver is dismantled (and freed > after RCU grace period) > > And store in sockets not only the pointer to napi_struct, but the > current generation id : If the generation id doesnt match, disable > the spinpoll until next packet rebuilds the cache again. This would require rcu_read_lock, aka preempt off, during polling, right? -Andi -- ak@linux.intel.com -- Speaking for myself only.