From owner-freebsd-hackers Wed May 30 8:38:51 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from peter3.wemm.org (c1315225-a.plstn1.sfba.home.com [65.0.135.147]) by hub.freebsd.org (Postfix) with ESMTP id 289CF37B424 for ; Wed, 30 May 2001 08:38:43 -0700 (PDT) (envelope-from peter@wemm.org) Received: from overcee.netplex.com.au (overcee.wemm.org [10.0.0.3]) by peter3.wemm.org (8.11.0/8.11.0) with ESMTP id f4UFchM20279 for ; Wed, 30 May 2001 08:38:43 -0700 (PDT) (envelope-from peter@wemm.org) Received: from wemm.org (localhost [127.0.0.1]) by overcee.netplex.com.au (Postfix) with ESMTP id 0E221380E; Wed, 30 May 2001 08:38:42 -0700 (PDT) (envelope-from peter@wemm.org) X-Mailer: exmh version 2.3.1 01/18/2001 with nmh-1.0.4 To: tlambert2@mindspring.com Cc: Mike Silbersack , Terry Lambert , hackers@FreeBSD.ORG Subject: Re: general speed differences between 4.1.1-RELEASE and 4.3-RELEASE In-Reply-To: <3B14D2AF.47CD9ECB@mindspring.com> Date: Wed, 30 May 2001 08:38:42 -0700 From: Peter Wemm Message-Id: <20010530153842.0E221380E@overcee.netplex.com.au> Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Terry Lambert wrote: > Mike Silbersack wrote: > > 1. Have the ata driver leave the write cache setting > > alone by default, providing a sysctl which can cause > > disabled or enabled if requested. When the default is > > allowed, put something in dmesg which says "Note: Write > > caching may be enabled. See ata(4) for the reliability > > implications of this." > > You need to look at the code; it would be relatively hard > to make this runtime tunable instead of boot-time tunable. False. It is actually very easy to change at runtime if it is done at a convenient time. We have had patches kicking around for something like 6 months now that do this. Cheers, -Peter -- Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au "All of this is for nothing if we don't go to the stars" - JMS/B5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message