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From: Ilya Dryomov <idryomov@gmail.com>
To: Bobby <italienisch1987@gmail.com>
Cc: dev <dev@ceph.io>, Ceph Development <ceph-devel@vger.kernel.org>
Subject: Re: [Ceph-qa] multiple BLK-MQ queues for Ceph's RADOS Block Device (RBD) and CephFS
Date: Tue, 14 Jul 2020 23:16:28 +0200	[thread overview]
Message-ID: <CAOi1vP-hmzEkkUWGOwxksQn8ny1HzgNURtnf1D33KQq4-49xgQ@mail.gmail.com> (raw)
In-Reply-To: <CA+xD70OJhkhH=+5W7M8NM54VPh42FmbD3O0yqKe1p-+=yd9zXQ@mail.gmail.com>

On Mon, Jul 13, 2020 at 8:40 PM Bobby <italienisch1987@gmail.com> wrote:
>
>
> Hi,
>
> I have a question regarding support for multiple BLK-MQ queues for Ceph's RADOS Block Device (RBD). The below given link says that the driver has been using the BLK-MQ interface for a while but not actually multiple queues until now with having a queue per-CPU. A change to not hold onto caps that aren't actually needed.  These improvements and more can be found as part of the Ceph changes for Linux 5.7, which should be released as stable in early June.
>
> https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.7-Ceph-Performance
>
> My question is: Is it possible that through Ceph FS (Filesystem in User Space) I can develop a multi-queue driver for Ceph? Asking because this way I can avoid kernel space. (https://docs.ceph.com/docs/nautilus/start/quick-cephfs/)

[ trimming CCs to dev and ceph-devel ]

Hi Bobby,

I'm not sure what you mean by a "multi-queue driver for Ceph".
blk-mq is the block layer framework, it has nothing to do with
filesystems, whether local sitting on top of a block device (such
as ext4 or XFS) or distributed sitting on top of a network stack
(such as CephFS).

Do you have a specific project in mind or are you just looking to
make ceph-fuse faster?

Thanks,

                Ilya

  reply	other threads:[~2020-07-14 21:16 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-13 18:40 multiple BLK-MQ queues for Ceph's RADOS Block Device (RBD) and CephFS Bobby
2020-07-14 21:16 ` Ilya Dryomov [this message]
     [not found]   ` <CA+xD70Neac2hpzu-Tg7s+1NCDegwzKs-zdTk8DYTWZPjNaexaA@mail.gmail.com>
2020-07-15 19:04     ` [Ceph-qa] " Ilya Dryomov
     [not found]       ` <CA+xD70MyfKgn5m3=JvgFfg+Ww=T8eJ2b9bogdbS4ogYAifNCTw@mail.gmail.com>
2020-07-16 20:11         ` Jason Dillaman

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