From owner-freebsd-hackers  Wed May 30  5: 5:35 2001
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Date: Wed, 30 May 2001 05:05:31 -0700
From: Kris Kennaway <kris@obsecurity.org>
To: Terry Lambert <tlambert2@mindspring.com>
Cc: Mike Silbersack <silby@silby.com>,
	Terry Lambert <tlambert@primenet.com>, hackers@FreeBSD.ORG
Subject: Re: general speed differences between 4.1.1-RELEASE and 4.3-RELEASE
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References: <20010527214531.R65666-100000@achilles.silby.com> <3B14D2AF.47CD9ECB@mindspring.com>
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In-Reply-To: <3B14D2AF.47CD9ECB@mindspring.com>; from tlambert2@mindspring.com on Wed, May 30, 2001 at 03:59:59AM -0700
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On Wed, May 30, 2001 at 03:59:59AM -0700, Terry Lambert 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."
>=20
> You need to look at the code; it would be relatively hard
> to make this runtime tunable instead of boot-time tunable.

Until recently it *was* a sysctl.

Kris
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