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Date: Wed, 5 Oct 2011 17:53:30 -0400
From: Christoph Hellwig <hch@infradead.org>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>,
        Rusty Russell <rusty@rustcorp.com.au>,
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        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/5] RFC: ->make_request support for virtio-blk
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 <20111005203116.GM30146@redhat.com>
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On Wed, Oct 05, 2011 at 04:31:16PM -0400, Vivek Goyal wrote:
> So you no longer believe that request queue overhead can be brought
> down to mangeable levels for these fast devices. And instead go for
> bio based drivers and give up on merging and implement own FLUSH/FUA
> machinery.

Not in a reasonable time frame. Having a common interface is still the
grand plan, but the virtio performance issues are hurting people so
badly that we need a fix soon.