Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964855AbWIRNbG (ORCPT ); Mon, 18 Sep 2006 09:31:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964916AbWIRNbG (ORCPT ); Mon, 18 Sep 2006 09:31:06 -0400 Received: from smtpout.mac.com ([17.250.248.173]:16125 "EHLO smtpout.mac.com") by vger.kernel.org with ESMTP id S964855AbWIRNbE (ORCPT ); Mon, 18 Sep 2006 09:31:04 -0400 In-Reply-To: References: <450DE3DE.50301@redhat.com> <450E914C.90203@redhat.com> Mime-Version: 1.0 (Apple Message framework v752.2) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: Cc: Rik van Riel , yogeshwar sonawane , linux-kernel Content-Transfer-Encoding: 7bit From: Kyle Moffett Subject: Re: How much kernel memory is in 64-bit OS ? Date: Mon, 18 Sep 2006 09:30:43 -0400 To: Jan Engelhardt X-Mailer: Apple Mail (2.752.2) X-Brightmail-Tracker: AAAAAQAAA+k= X-Language-Identified: TRUE Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1059 Lines: 36 On Sep 18, 2006, at 08:34:25, Jan Engelhardt wrote: >>>> Sure, people said that too when going from 16 bits to 32 bits, >>>> but that was only a factor 2^16 difference. This time it's the >>>> square of the previous difference. >>> >>> Not quite the square :) >> >> 2^32 is the square of 2^16 :) > > As mentioned above, "the square of the previos" [16 to 32] > "difference". Call me nitpicky, but: > > (2^32 - 2^16)^2 != (2^64 - 2^32) Well into the nitpicking territory... I think you missed where he said "factor 2^16 difference". So these: > Going from 32 to 64: (2^64 - 2^32) > Going from 16 to 32: (2^32 - 2^16) Should actually be these: Going from 32 to 64: (2^64 / 2^32) Going from 16 to 32: (2^32 / 2^16) And: (2^32 / 2^16)^2 = (2^64 / 2^32) => (2^16)^2 = (2^32) Cheers, Kyle Moffett - 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/