Date: Fri, 01 Jun 2001 10:15:16 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Peter Wemm <peter@wemm.org> 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 Message-ID: <3B17CDA4.8AADBD1@mindspring.com> References: <20010530153842.0E221380E@overcee.netplex.com.au>
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Peter Wemm wrote: > 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. The patches don't (and possibly can't) do enough to ensure a smooth transition. Among other things, they would have to turn off soft updates. Please see my other post on this subject. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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