linux-kernel - Re: [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO

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Date:	Mon, 2 Jan 2012 11:23:39 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Stefan Hajnoczi <stefanha@...il.com>,
	Minchan Kim <minchan@...nel.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,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO

On Mon, Jan 02, 2012 at 05:18:13PM +0100, Paolo Bonzini wrote:
> >I tried a few times, and the only constant measureable
> >thing was that it regressed performance when used for rotating devices
> >in a few benchmarks.
> 
> Were you trying with cache=none or writeback?  For cache=none,
> that's exactly what I'd expect.  cache=writeback could be more
> interesting...

cache=none - cache=writeback isn't something people should ever use
except for read-only or extremly read-mostly workloads.

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