linux-kernel - Re: [PATCH 2/5] virtio_blk: implement REQ

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Date:	Wed, 18 Aug 2010 19:52:02 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Christoph Hellwig <hch@....de>
Cc:	Tejun Heo <tj@...nel.org>, jaxboe@...ionio.com,
	linux-fsdevel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org, James.Bottomley@...e.de, tytso@....edu,
	chris.mason@...cle.com, swhiteho@...hat.com,
	konishi.ryusuke@....ntt.co.jp, dm-devel@...hat.com, vst@...b.net,
	jack@...e.cz, rwheeler@...hat.com, hare@...e.de, neilb@...e.de,
	mst@...hat.com
Subject: Re: [PATCH 2/5] virtio_blk: implement REQ_FLUSH/FUA support

On Tue, 17 Aug 2010 10:53:27 pm Christoph Hellwig wrote:
> Given how little testing lguest gets compared to qemu I really don't
> want a protocol addition for it unless it really buys us something.
> Once we're done with this barrier conversion I plan into benchmarking
> FUA and a pre-flush tag on the command for virtio in real life setups,
> and see if it actually buys us anything.

Absolutely.  Lguest should follow, not lead!

Rusty.
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