From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 18 Aug 2001 06:24:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 18 Aug 2001 06:24:47 -0400 Received: from femail25.sdc1.sfba.home.com ([24.254.60.15]:31183 "EHLO femail25.sdc1.sfba.home.com") by vger.kernel.org with ESMTP id ; Sat, 18 Aug 2001 06:24:34 -0400 Content-Type: text/plain; charset=US-ASCII From: Nicholas Knight Reply-To: tegeran@home.com To: ebiederm@xmission.com (Eric W. Biederman), Dan Hollis Subject: Re: Encrypted Swap Date: Sat, 18 Aug 2001 03:24:28 -0700 X-Mailer: KMail [version 1.2] Cc: , David Christensen , Holger Lubitz , In-Reply-To: In-Reply-To: MIME-Version: 1.0 Message-Id: <01081803242800.00266@c779218-a> Content-Transfer-Encoding: 7BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Saturday 18 August 2001 02:52 am, Eric W. Biederman wrote: > Dan Hollis writes: > > On 17 Aug 2001, Eric W. Biederman wrote: > > > Clearing memory on most machines takes a 1s or less. Think of > > > memory fill rates at the 800MB/s level. Most BIOS's seem to clear > > > some of the memory but I haven't read their code to see what they > > > are doing. > > > > Ive measured rates far lower than that, at least for SDRAM. > > Hmm. The numbers were off the top of my head and I've been messing > with DDR SDRAM quite a bit so I may have doubled it. Hmm. > > Nope. I was remember something close to the typical streams numbers > on an Athlon with DDR SDRAM. Since those are read-modify-write > numbers they should be close to the write numbers for normal SDRAM. > > With a PII/PIII and PC100 SDRAM I have measured about 640 MB/s writes. > I'm not sure where you're pulling these numbers from, but being a hardcore FPS gamer, I can tell you from experience, PC100 SDRAM does NOT hit 640MB/sec! Esspecialy not on a PII! PC100 SDRAM on my current 800Mhz non-tbird Athlon currently peaks near 250MB/sec