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Date:      Tue, 25 Jun 2002 20:55:33 +0100
From:      Nuno Teixeira <nunotex@pt-quorum.com>
To:        freebsd-stable@freebsd.org
Cc:        Soeren Schmidt <sos@freebsd.dk>
Subject:   hw.ata.tags="1" && hw.ata.wc="0": invalidating queued requests?
Message-ID:  <20020625195533.GA267@gw.tex.bogus>
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    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:
    
    -------------------------------------------------------------
    ad0: READ command timeout tag=0 serv=0 - resetting
    ad0: invalidating queued requests
    ata0: resetting devices .. ad0: invalidating queued requests
    done
    ad0: no request for tag=0
    ad0: invalidating queued requests
    ad0: READ command timeout tag=0 serv=0 - resetting
    ad0: invalidating queued requests
    ata0: resetting devices .. ad0: invalidating queued requests
    done
    ad0: timeout waiting for READY
    ad0: invalidating queued requests
    ad0: timeout sending command=00 s=d0 e=04
    ad0: flush queue failed
     - resetting
    ata0: resetting devices .. ad0: invalidating queued requests
    done
    ad0: READ command timeout tag=0 serv=0 - resetting
    ad0: invalidating queued requests
    ata0: resetting devices .. ad0: invalidating queued requests
    done
    ad0: no request for tag=0
    ad0: invalidating queued requests
    
    (...)
    -------------------------------------------------------------
    
    When I use hw.ata.tags="1" && hw.ata.wc="1" the the system runs without 
    any problems.
    
    
    Am I missing something?
    
    Thanks very much,
    
    		Nuno Teixeira
    
    
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