Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753612AbWKDTHU (ORCPT ); Sat, 4 Nov 2006 14:07:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753616AbWKDTHU (ORCPT ); Sat, 4 Nov 2006 14:07:20 -0500 Received: from sp604001mt.neufgp.fr ([84.96.92.60]:31966 "EHLO Smtp.neuf.fr") by vger.kernel.org with ESMTP id S1753612AbWKDTHT (ORCPT ); Sat, 4 Nov 2006 14:07:19 -0500 Date: Sat, 04 Nov 2006 20:07:22 +0100 From: Eric Dumazet Subject: Re: New filesystem for Linux In-reply-to: To: Mikulas Patocka Cc: linux-kernel@vger.kernel.org Message-id: <454CE4EA.7030500@cosmosbay.com> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 8BIT References: <454A76CC.6030003@cosmosbay.com> User-Agent: Thunderbird 1.5.0.7 (Windows/20060909) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 745 Lines: 17 Mikulas Patocka a ?crit : >> The problem with a per_cpu biglock is that you may consume a lot of >> RAM for big NR_CPUS. Count 32 KB per 'biglock' if NR_CPUS=1024 > > Does one Linux kernel run on system with 1024 cpus? I guess it must fry > spinlocks... (or even lockup due to spinlock livelocks) Not here in my house, but I was told such beasts exist somewhere on this planet :) You can have a kernel compiled with NR_CPUS=1024, but still run it on your laptop, with a single CPU available... - 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/