From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267327AbUHMTdQ (ORCPT ); Fri, 13 Aug 2004 15:33:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267325AbUHMTam (ORCPT ); Fri, 13 Aug 2004 15:30:42 -0400 Received: from cantor.suse.de ([195.135.220.2]:46792 "EHLO Cantor.suse.de") by vger.kernel.org with ESMTP id S266916AbUHMT3E (ORCPT ); Fri, 13 Aug 2004 15:29:04 -0400 Date: Fri, 13 Aug 2004 21:28:57 +0200 From: Andi Kleen To: Stephen Hemminger Cc: davem@redhat.com, alan@lxorguk.ukuu.org.uk, tytso@mit.edu, netdev@oss.sgi.com, linux-kernel@vger.kernel.org, greearb@candelatech.com Subject: Re: [RFC] enhanced version of net_random() Message-Id: <20040813212857.7dd50320.ak@suse.de> In-Reply-To: <20040813115140.0f09d889@dell_ss3.pdx.osdl.net> References: <20040812104835.3b179f5a@dell_ss3.pdx.osdl.net> <20040812124854.646f1936.davem@redhat.com> <20040813115140.0f09d889@dell_ss3.pdx.osdl.net> X-Mailer: Sylpheed version 0.9.11 (GTK+ 1.2.10; i686-pc-linux-gnu) 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 On Fri, 13 Aug 2004 11:51:40 -0700 Stephen Hemminger wrote: > Here is another alternative, using tansworthe generator. It uses percpu > state. The one small semantic change is the net_srandom() only affects > the current cpu's seed. The problem was that having it change all cpu's > seed would mean adding locking I would just update the other CPUs without locking. Taking a random number from a partially updated state shouldn't be a big issue. -Andi