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From: Anton Nefedov <anton.nefedov@virtuozzo.com>
To: qemu-devel@nongnu.org
Cc: qemu-block@nongnu.org, den@virtuozzo.com, kwolf@redhat.com,
	mreitz@redhat.com, eblake@redhat.com
Subject: Re: [Qemu-devel] [PATCH v4 00/15] qcow2: space preallocation and COW improvements
Date: Thu, 21 Sep 2017 20:16:38 +0300	[thread overview]
Message-ID: <f27a04c3-f4ac-3220-4a6a-9aca0c36aebb@virtuozzo.com> (raw)
In-Reply-To: <1501597152-25342-1-git-send-email-anton.nefedov@virtuozzo.com>


On 1/8/2017 5:18 PM, Anton Nefedov wrote:
> 
> This pull request is to address a few performance problems of qcow2 format:
> 
>    1. non cluster-aligned write requests (to unallocated clusters) explicitly
>      pad data with zeroes if there is no backing data. This can be avoided
>      and the whole clusters are preallocated and zeroed in a single
>      efficient write_zeroes() operation, also providing better host file
>      continuity
> 
>    2. moreover, efficient write_zeroes() operation can be used to preallocate
>      space megabytes ahead which gives noticeable improvement on some storage
>      types (e.g. distributed storages where space allocation operation is
>      expensive)
> 

ping?
I'd send the rebased series but there are no real conflicts so

/thanks,
Anton

      parent reply	other threads:[~2017-09-21 17:16 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-01 14:18 [Qemu-devel] [PATCH v4 00/15] qcow2: space preallocation and COW improvements Anton Nefedov
2017-08-01 14:18 ` [Qemu-devel] [PATCH v4 01/15] mirror: inherit supported write/zero flags Anton Nefedov
2017-08-04 15:13   ` [Qemu-devel] [PATCH v4 for-2.10 " Eric Blake
2017-08-01 14:18 ` [Qemu-devel] [PATCH v4 02/15] blkverify: set " Anton Nefedov
2017-08-04 15:23   ` Eric Blake
2017-08-07 12:19     ` Anton Nefedov
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 03/15] block: introduce BDRV_REQ_ALLOCATE flag Anton Nefedov
2017-08-04 19:51   ` Eric Blake
2017-08-29 12:47   ` [Qemu-devel] [Qemu-block] " Alberto Garcia
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 04/15] block: treat BDRV_REQ_ALLOCATE as serialising Anton Nefedov
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 05/15] file-posix: support BDRV_REQ_ALLOCATE Anton Nefedov
2017-08-29 13:00   ` [Qemu-devel] [Qemu-block] " Alberto Garcia
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 06/15] block: support BDRV_REQ_ALLOCATE in passthrough drivers Anton Nefedov
2017-08-29 13:07   ` [Qemu-devel] [Qemu-block] " Alberto Garcia
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 07/15] qcow2: preallocation at image expand Anton Nefedov
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 08/15] qcow2: set inactive flag Anton Nefedov
2017-08-04 20:00   ` Eric Blake
2017-08-07 12:06     ` Anton Nefedov
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 09/15] qcow2: truncate preallocated space Anton Nefedov
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 10/15] qcow2: check space leak at the end of the image Anton Nefedov
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 11/15] qcow2: move is_zero() up Anton Nefedov
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 12/15] qcow2: skip writing zero buffers to empty COW areas Anton Nefedov
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 13/15] qcow2: allocate image space by-cluster Anton Nefedov
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 14/15] iotest 190: test BDRV_REQ_ALLOCATE Anton Nefedov
2017-08-04 15:27   ` Eric Blake
2017-08-01 14:19 ` [Qemu-devel] [PATCH v4 15/15] iotest 134: test cluster-misaligned encrypted write Anton Nefedov
2017-09-21 17:16 ` Anton Nefedov [this message]

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