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Re: [Qemu-devel] [PATCH 0/2] Enable qemu block layer to not flush

From: Jamie Lokier
Subject: Re: [Qemu-devel] [PATCH 0/2] Enable qemu block layer to not flush
Date: Tue, 11 May 2010 22:48:32 +0100
User-agent: Mutt/1.5.13 (2006-08-11)

Anthony Liguori wrote:
> There's got to be a better place to fix this.  Disable barriers in your 
> guests?

If only it were that easy.

OS installs are the thing that this feature would most help.  They
take ages, do a huge amount of writing with lots of seeking, and if
the host fails you're going to discard the image.

I'm not sure how I would change that setting for most OS install GUIs,
especially Windows, or if it's even possible.

It's usually much easier to change barrier settings after installing
and you've got a command line or registry editing tool.  But by then,
it's not useful any more.

Any other ideas?

-- Jamie

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