linux-kernel - Re: [PATCH 0/5] RFC: ->make_request support for virtio-blk

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Message-ID: <20111005215330.GA13514@infradead.org>
Date:	Wed, 5 Oct 2011 17:53:30 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Chris Wright <chrisw@...s-sol.org>,
	Jens Axboe <axboe@...nel.dk>,
	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] RFC: ->make_request support for virtio-blk

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.

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