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Date: Mon, 16 Jul 2001 03:33:22 +1200
From: Chris Wedgwood <cw@f00f.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Daniel Phillips <phillips@bonn-fries.net>,
        Andrew Morton <andrewm@uow.edu.au>,
        Andreas Dilger <adilger@turbolinux.com>,
        "Albert D. Cahalan" <acahalan@cs.uml.edu>,
        Ben LaHaise <bcrl@redhat.com>,
        Ragnar Kjxrstad <kernel@ragnark.vestdata.no>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        mike@bigstorage.com, kevin@bigstorage.com, linux-lvm@sistina.com
Subject: Re: [PATCH] 64 bit scsi read/write
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On Sun, Jul 15, 2001 at 04:32:59PM +0100, Alan Cox wrote:

    Another way is to time
    
    	write block
    	write barrier
    	write same block
    	write barrier
    	repeat
    
    If the write barrier is working you should be able to measure the
    drive rpm 8)

Yeah, I was thinking of doing this with caches turned off, since I
know how to do that, but not a write-barrier.




  --cs
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