[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCHv2] block: optimize zero writes with bdrv_write_z
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [PATCHv2] block: optimize zero writes with bdrv_write_zeroes |
Date: |
Fri, 28 Mar 2014 09:53:54 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 |
On 03/28/2014 08:46 AM, Peter Lieven wrote:
> this patch tries to optimize zero write requests
> by automatically using bdrv_write_zeroes if it is
> supported by the format.
>
> This significantly speeds up file system initialization and
> should speed zero write test used to test backend storage
> performance.
>
>
> block.c | 39 ++++++++++++++++++++++++++++++++++++++-
> include/block/block_int.h | 12 ++++++++++++
> include/qemu-common.h | 1 +
> qemu-options.hx | 6 ++++++
> util/iov.c | 21 +++++++++++++++++++++
> 5 files changed, 78 insertions(+), 1 deletion(-)
>
Is there any QMP query- command that can expose the current setting of
this value? Is this something worth making changeable during runtime?
Is it something that can be requested per-disk at hotplug time?
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
signature.asc
Description: OpenPGP digital signature