Re: [PATCH blktests] common/xfs: ignore the 32M log size during mkfs.xfs

[Chaitanya Kulkarni <chaitanyak@nvidia.com>]

Shinichiro/Yi,

On 10/23/22 17:50, Shinichiro Kawasaki wrote:
> On Oct 23, 2022 / 23:27, Yi Zhang wrote:
>> On Sat, Oct 22, 2022 at 7:57 AM Shinichiro Kawasaki
>> <shinichiro.kawasaki@wdc.com> wrote:
>>>
>>> On Oct 21, 2022 / 21:42, Chaitanya Kulkarni wrote:
>>>
>>> ...
>>>
>>>> I think creating a minimal setup is a part of the testcase and we should
>>>> not change it, unless there is a explicit reason for doing so.
>>>
>>> I see, I find no reason to change the "minimal log size policy". Let's go with
>>> 64MB log size to keep it.
>>>
>>> Yi, would you mind reposting v2 with size=64m?
>> Sure, and before I post it, I want to ask for suggestions about some
>> other code changes:
>>
>> After set log size with 64M, I found nvme/012 nvme/013 will be
>> failed[1], and there was not enough space for fio with size=950m
>> testing.
>> Either [2] or [3] works, which one do you prefer, or do you have some
>> other suggestion for it? Thanks.
> 
> Thank you for testing. I guess fio I/O size=950m was chosen subtracting some
> super block and log size from 1GB NVME device size. Now we increase the log
> size, then the I/O size 950m is larger than the usable xfs size, probably.
> 
> Chaitania, what' your thought about the fix approach? To keep the "minimal log
> size policy", I guess the approach [3] to reduce fio I/O size to 900m is more
> appropriate, but would like to hear your insight.

I'm fine with adjusting the size to it can fit with new minimum log
sizes.

> 
> 
>  From Yi's observation, I found a couple of improvement opportunities which are
> beyond scope of this fix. Here I note them as memorandum (patches are welcome :)
> 
> 1) Assuming nvme device size 1GB define in nvme/012 and nvme/013 has relation to
>     the fio I/O size 950m defined in common/xfs, these values should be defined
>     at single place. Probably we should define both in nvme/012 and nvme/013.

Agree.

> 
> 2) The fio I/O size 950m is defined in _xfs_run_fio_verify_io() which is called
>     from nvme/035. Then, it is implicitly assumed that TEST_DEV for nvme/035 has
>     size 1GB (or larger). I found that nvme/035 fails with 512MB nvme device.
>     We should fix this by calculating fio I/O size from TEST_DEV size. (Or
>     require 1GB nvme device size for the test case.)
> 

Also, agree on this.

Above two listed fixes should be done as a part of this fix only.

I'd expect to see a patch series to fix all the issues listed above,
please CC me so I can review this with priority.

-ck