# Re: \[PATCH v5 00/14\] blk-mq: Reduce static requests memory footprint for shared sbitmap

- From: John Garry \<hidden\>
- Date: 2021-10-08 08:05:05 
- List: linux-block
- Page: https://ratatoskr.run/linux-block/2021/10/1534976
- Thread: https://ratatoskr.run/linux-block/2021/10/1531231/t.md

```text
On 08/10/2021 04:11, Bart Van Assche wrote:

+

> On 10/7/21 13:31, Kashyap Desai wrote:
>> I tested this patchset on 5.15-rc4 (master) -
>> https://github.com/torvalds/linux.git
>>
>> #1 I noticed some performance regression @mq-deadline scheduler which is not
>> related to this series. I will bisect and get more detail about this issue
>> separately.
>
> Please test this patch series on top of Jens' for-next branch (git://git.kernel.dk/linux-block). The mq-deadline performance on Jens' for-next branch should match that of kernel v5.13.

Kashyap did also mention earlier that he say the drop from v5.11 -> v5.12.

The only thing I saw possibly related there was Jan's work in https://lore.kernel.org/linux-block/20210111164717.21937-1-jack@suse.cz/
to fix a performance regression witnessed on megaraid sas for slower media.

But I quite doubtful that this is the issue.

Thanks,
John
```