On 2023-07-13 17:10, Anand Jain wrote:
>
>
> On 13/07/2023 20:04, Pankaj Raghav wrote:
>>
>> Hi Anand,
>>
>> On 2023-07-12 09:06, Anand Jain wrote:
>>> On 16/12/22 18:57, Pankaj Raghav wrote:
>>>> Since 3687fcb0752a ("btrfs: zoned: make auto-reclaim less aggressive")
>>>> commit and cc4804bfd639 ("btrfs: skip reclaim if block_group is empty"),
>>>> reclaim algorithm has been changed to be less aggressive, which breaks this
>>>> test.
>>>>
>>>> The test has been adapted so that the new auto-reclaim algorithm can be
>>>> tested with the following flow:
>>>> - Write a small file
>>>> - Write a big file that crosses the reclaim limit
>>>> - Delete the big file
>>>> - Check that only the block group that contained the small file is reclaimed,
>>>> and the small file is relocated to a new block group.
>>>> ---
>>>
>>> SOB is missing.
>>>
>>> Pankaj, this patch has not been integrated yet.
>>> Could you please resend it?
>>>
>>
>> Actually, I encountered an issue with this testcase where it worked
>> perfectly well for smaller drives, but started to fail for bigger ZNS drives.
>>
>> Thread: https://lore.kernel.org/all/20220819115337.35681-1-p.raghav@xxxxxxxxxxx/
>>
>> Could you try it in your setup and see if it works correctly?
>
> Right. I'm also facing some issues. However, the stack trace indicates
> a memory error, which I attributed to my low-resourced nullb device.
> I'm trying to emulate a zoned device using other methods, but I haven't been successful yet.
>
You could easily emulate a zoned device in QEMU with either using NVMe[1] or virtio[2]
[1] https://qemu.readthedocs.io/en/latest/system/devices/nvme.html#zoned-namespaces
[2] https://www.qemu.org/2022/11/17/zoned-emulation/
