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Re: [Qemu-block] [PATCH v10 05/17] iotests: Add test 179 to cover write
From: |
Eric Blake |
Subject: |
Re: [Qemu-block] [PATCH v10 05/17] iotests: Add test 179 to cover write zeroes with unmap |
Date: |
Fri, 28 Apr 2017 14:48:27 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.0 |
On 04/28/2017 02:28 PM, Max Reitz wrote:
> On 27.04.2017 03:46, Eric Blake wrote:
>> No tests were covering write zeroes with unmap. Additionally,
>> I needed to prove that my previous patches for correct status
>> reporting and write zeroes optimizations actually had an impact.
>>
>> The test works for cluster_size between 8k and 2M (for smaller
>> sizes, it fails because our allocation patterns are not contiguous
>> with small clusters).
>>
>> Signed-off-by: Eric Blake <address@hidden>
>>
>> ---
>> v10: drop any changes to v2 files, rewrite test to work with updates
>> earlier in the series, add a blkdebug probe
>> v9: new patch
>> ---
>> tests/qemu-iotests/179 | 123
>> +++++++++++++++++++++++++++++++++++++++++++++
>> tests/qemu-iotests/179.out | 90 +++++++++++++++++++++++++++++++++
>> tests/qemu-iotests/group | 1 +
>> 3 files changed, 214 insertions(+)
>> create mode 100755 tests/qemu-iotests/179
>> create mode 100644 tests/qemu-iotests/179.out
>
> Can I convince you to write this test in a different way? I really have
> a hard time following all of the writes and building a mental image of
> how the qcow2 file should look in the end so I can compare it to the map
> output.
>
> I'd like it better if you would check the qcow2 file after each group of
> write operations, maybe even creating a new image for every such group.
> But even just having more qemu-img map calls (and changing nothing else)
> would help me a lot.
Will do.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
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- Re: [Qemu-block] [Qemu-devel] [PATCH v10 01/17] block: Update comments on BDRV_BLOCK_* meanings, (continued)
- [Qemu-block] [PATCH v10 03/17] qcow2: Reuse preallocated zero clusters, Eric Blake, 2017/04/26
- [Qemu-block] [PATCH v10 04/17] qcow2: Optimize zero_single_l2() to minimize L2 churn, Eric Blake, 2017/04/26
- [Qemu-block] [PATCH v10 06/17] qemu-io: Don't open-code QEMU_IS_ALIGNED, Eric Blake, 2017/04/26
- [Qemu-block] [PATCH v10 05/17] iotests: Add test 179 to cover write zeroes with unmap, Eric Blake, 2017/04/26
- [Qemu-block] [PATCH v10 07/17] qemu-io: Switch 'alloc' command to byte-based length, Eric Blake, 2017/04/26
[Qemu-block] [PATCH v10 08/17] qemu-io: Switch 'map' output to byte-based reporting, Eric Blake, 2017/04/26
[Qemu-block] [PATCH v10 09/17] qcow2: Optimize write zero of unaligned tail cluster, Eric Blake, 2017/04/26