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Message-ID: <6934efce0712041603y65e704c9v6377761ef292b6a5@mail.gmail.com>
Date: Tue, 4 Dec 2007 16:03:45 -0800
From: "Jared Hulbert" <jaredeh@gmail.com>
To: "=?ISO-8859-1?Q?J=F6rn_Engel?=" <joern@logfs.org>
Subject: Re: solid state drive access and context switching
Cc: "Alan Cox" <alan@lxorguk.ukuu.org.uk>,
       "Chris Friesen" <cfriesen@nortel.com>, linux-kernel@vger.kernel.org
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> > Maybe I'm missing something but I don't see it.  We want a block
> > interface for these devices, we just need a faster slimmer interface.
> > Maybe a new mtdblock interface that doesn't do erase would be the
> > place for?
>
> Doesn't do erase?  MTD has to learn almost all tricks from the block
> layer, as devices are becoming high-latency high-bandwidth, compared to
> what MTD was designed for.  In order to get any decent performance, we
> need asynchronous operations, request queues and caching.
>
> The only useful advantage MTD does have over block devices is an
> _explicit_ erase operation.  Did you mean "doesn't do _implicit_ erase".


You're right.  That the point I was trying to make, albeit badly, MTD
isn't the place for this.  The fact that more and more of what the MTD
is being used for looks a lot like the block layer is a whole
different discussion.
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