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    SubjectRE: [PATCH v5 00/14] blk-mq: Reduce static requests memory footprint for shared sbitmap
    > -----Original Message-----
    > From: John Garry [mailto:john.garry@huawei.com]
    > Sent: Tuesday, October 5, 2021 7:05 PM
    > 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
    > 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?

    John - I am still working on this. System was not available due to some
    other debugging.

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