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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <d3a11ba59cc0a912fa6486a148a7458a@mail.gmail.com>
Date:   Tue, 5 Oct 2021 19:23:13 +0530
From:   Kashyap Desai <kashyap.desai@...adcom.com>
To:     John Garry <john.garry@...wei.com>, Jens Axboe <axboe@...nel.dk>
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

> -----Original Message-----
> From: John Garry [mailto:john.garry@...wei.com]
> Sent: Tuesday, October 5, 2021 7:05 PM
> 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?

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

Download attachment "smime.p7s" of type "application/pkcs7-signature" (4212 bytes)