From owner-freebsd-stable  Sat Jun 29  6:46:25 2002
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From: Soeren Schmidt <sos@freebsd.dk>
Message-Id: <200206291346.g5TDkHd9074854@freebsd.dk>
Subject: Re: hw.ata.tags="1" && hw.ata.wc="0": invalidating queued requests?
In-Reply-To: <20020625195533.GA267@gw.tex.bogus>
To: Nuno Teixeira <nunotex@pt-quorum.com>
Date: Sat, 29 Jun 2002 15:46:17 +0200 (CEST)
Cc: freebsd-stable@freebsd.org
Reply-To: sos@freebsd.dk
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It seems Nuno Teixeira wrote:
> 
>     Hello to all,
>     
>     For a long time that I am seeking over the groups about ata tags and 
>     write cache. What I heard is that when hw.ata.tags is activated, 
>     hw.ata.wc is ignored. I tested my system with:
>     
>     - softupdates enabled in all filesystems
>     
>     - ad0: 29314MB <IBM-DTLA-307030> [59560/16/63] at ata0-master tagged 
>       UDMA33
>     
>     - /boot/loader.conf:
>     
>     	hw.ata.tags="1"
>     	hw.ata.wc="0"
>     
>     and the system gives a lot of errors (without crashing) like:
>     (...)
>     When I use hw.ata.tags="1" && hw.ata.wc="1" the the system runs without 
>     any problems.
>     
>     Am I missing something?

You can only do tags when WC is enabled, the updated driver in 4.6 forward
wil do this automagically...

-Søren

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