Re: [PATCH v8 05/11] null_blk: allow non power of 2 zoned devices
From: Pankaj Raghav
Date: Fri Jul 29 2022 - 03:52:05 EST
On 2022-07-27 23:59, Chaitanya Kulkarni wrote:
>> Sequential Write:
>>
>> x-----------------x---------------------------------x---------------------------------x
>> | IOdepth | 8 | 16 |
>> x-----------------x---------------------------------x---------------------------------x
>> | | KIOPS |BW(MiB/s) | Lat(usec) | KIOPS |BW(MiB/s) | Lat(usec) |
>> x-----------------x---------------------------------x---------------------------------x
>> | Without patch | 578 | 2257 | 12.80 | 576 | 2248 | 25.78 |
>> x-----------------x---------------------------------x---------------------------------x
>> | With patch | 581 | 2268 | 12.74 | 576 | 2248 | 25.85 |
>> x-----------------x---------------------------------x---------------------------------x
>>
>> Sequential read:
>>
>> x-----------------x---------------------------------x---------------------------------x
>> | IOdepth | 8 | 16 |
>> x-----------------x---------------------------------x---------------------------------x
>> | | KIOPS |BW(MiB/s) | Lat(usec) | KIOPS |BW(MiB/s) | Lat(usec) |
>> x-----------------x---------------------------------x---------------------------------x
>> | Without patch | 667 | 2605 | 11.79 | 675 | 2637 | 23.49 |
>> x-----------------x---------------------------------x---------------------------------x
>> | With patch | 667 | 2605 | 11.79 | 675 | 2638 | 23.48 |
>> x-----------------x---------------------------------x---------------------------------x
>>
>> Random read:
>>
>> x-----------------x---------------------------------x---------------------------------x
>> | IOdepth | 8 | 16 |
>> x-----------------x---------------------------------x---------------------------------x
>> | | KIOPS |BW(MiB/s) | Lat(usec) | KIOPS |BW(MiB/s) | Lat(usec) |
>> x-----------------x---------------------------------x---------------------------------x
>> | Without patch | 522 | 2038 | 15.05 | 514 | 2006 | 30.87 |
>> x-----------------x---------------------------------x---------------------------------x
>> | With patch | 522 | 2039 | 15.04 | 523 | 2042 | 30.33 |
>> x-----------------x---------------------------------x---------------------------------x
>>
>> Minor variations are noticed in Sequential write with io depth 8 and
>> in random read with io depth 16. But overall no noticeable differences
>> were noticed
>
> minor variations in with aspect of the performance ?
> are these documented somewhere ?
>
The table above documents those minor variations in performance.
> move the large table of performance numbers to the cover letter it looks
> ugly in the git log...
>
I could do that.
>