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Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign |
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Date: |
Mon, 11 May 2015 16:08:17 +0100 |
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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.
Stefan
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Description: PGP signature
- [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign, Denis V. Lunev, 2015/05/04
- [Qemu-block] [PATCH 1/2] block: minimal bounce buffer alignment, Denis V. Lunev, 2015/05/04
- Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign,
Stefan Hajnoczi <=
- Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign, Denis V. Lunev, 2015/05/11
- Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign, Denis V. Lunev, 2015/05/11
- Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign, Stefan Hajnoczi, 2015/05/12
- Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign, Denis V. Lunev, 2015/05/12
- Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign, Paolo Bonzini, 2015/05/12
- Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign, Stefan Hajnoczi, 2015/05/13
- Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign, Denis V. Lunev, 2015/05/13
- Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign, Paolo Bonzini, 2015/05/29
- Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign, Paolo Bonzini, 2015/05/14
- Re: [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign, Denis V. Lunev, 2015/05/11