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Re: [Qemu-devel] [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign
Date: Mon, 11 May 2015 16:08:17 +0100
User-agent: Mutt/1.5.23 (2014-03-12)

On Mon, May 04, 2015 at 04:42:22PM +0300, Denis V. Lunev wrote:
> The difference is quite reliable and the same 5%.
>   qemu-io -n -c 'write -P 0xaa 0 1G' 1.img
> for image in qcow2 format is 1% faster.

I looked a little at the qemu-io invocation but am not clear why there
would be a measurable performance difference.  Can you explain?

What about real qemu-img or QEMU use cases?

I'm okay with the patches themselves, but I don't really understand why
this code change is justified.


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