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

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Date:   Tue, 5 Oct 2021 14:34:39 +0100
From:   John Garry <john.garry@...wei.com>
To:     Jens Axboe <axboe@...nel.dk>, <kashyap.desai@...adcom.com>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <ming.lei@...hat.com>, <hare@...e.de>, <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH v5 00/14] blk-mq: Reduce static requests memory footprint
 for shared sbitmap

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