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Subject: Re: [PATCH v5 00/14] blk-mq: Reduce static requests memory footprint
 for shared sbitmap
To:     Jens Axboe <axboe@kernel.dk>, <kashyap.desai@broadcom.com>
CC:     <linux-block@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <ming.lei@redhat.com>, <hare@suse.de>, <linux-scsi@vger.kernel.org>
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 <ae33dde8-96e8-2978-5f32-c7e0a6136e8e@kernel.dk>
From:   John Garry <john.garry@huawei.com>
Message-ID: <81d9e019-b730-221e-a8c0-f72a8422a2ec@huawei.com>
Date:   Tue, 5 Oct 2021 14:34:39 +0100
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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