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

[John Garry]

On 05/10/2021 13:35, Jens Axboe wrote:
> > Baseline is 1b2d1439fc25 (block/for-next) Merge branch 'for-5.16/io_uring'
> > into for-next
> Let's get this queued up for testing, thanks John.

Cheers, appreciated

@Kashyap, You mentioned that when testing you saw a performance 
regression from v5.11 -> v5.12 - any idea on that yet? Can you describe 
the scenario, like IO scheduler and how many disks and the type? Does 
disabling host_tagset_enable restore performance?

From checking differences between those kernels, I don't see anything 
directly relevant in sbitmap support or in the megaraid sas driver.

Thanks,
John