From: Jason Dillaman <jdillama@redhat.com>
To: Alexandre DERUMIER <aderumier@odiso.com>
Cc: Somnath Roy <Somnath.Roy@sandisk.com>,
Samuel Just <sjust@redhat.com>,
ceph-devel <ceph-devel@vger.kernel.org>
Subject: Re: Severe performance degradation with jewel rbd image
Date: Tue, 31 May 2016 15:57:29 -0400 [thread overview]
Message-ID: <CA+aFP1DRf8TH5tJxSjjk1ptaxDTwNWpBbSCAKVzGj+XNgE5i+Q@mail.gmail.com> (raw)
In-Reply-To: <417572431.751254216.1464420555984.JavaMail.zimbra@oxygem.tv>
That QEMU patch looks like it only supports raw devices and
pre-allocated files. Once librbd/librados can eliminate all the
threading/queuing slowdowns, a similar approach could be extended to
RBD images without the need to open multiple copies of the same image.
On Sat, May 28, 2016 at 3:29 AM, Alexandre DERUMIER <aderumier@odiso.com> wrote:
> Hi,
>
> qemu should have soon multithreaded disk access support (multi queues + multi iothreads)
>
> https://lists.gnu.org/archive/html/qemu-devel/2016-05/msg05023.html
>
> Do you think it'll work with exclusive-lock ?
>
> ----- Mail original -----
> De: "Jason Dillaman" <jdillama@redhat.com>
> À: "Somnath Roy" <Somnath.Roy@sandisk.com>
> Cc: "Samuel Just" <sjust@redhat.com>, "ceph-devel" <ceph-devel@vger.kernel.org>
> Envoyé: Jeudi 26 Mai 2016 20:52:26
> Objet: Re: Severe performance degradation with jewel rbd image
>
> You can dynamically enable/disable exclusive-lock, object-map,
> fast-diff, and journaling after the image is created via "rbd feature
> disable <image-spec> <feature>". The deep-flatten feature can be
> disabled-only via the same CLI.
> --
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--
Jason
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next prev parent reply other threads:[~2016-05-31 19:57 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-25 20:48 Severe performance degradation with jewel rbd image Somnath Roy
2016-05-25 22:47 ` Jason Dillaman
2016-05-25 23:08 ` Somnath Roy
2016-05-26 0:50 ` Jason Dillaman
2016-05-26 3:39 ` Somnath Roy
2016-05-26 3:52 ` Jason Dillaman
2016-05-26 4:19 ` Somnath Roy
2016-05-26 13:28 ` Jason Dillaman
2016-05-26 17:47 ` Somnath Roy
2016-05-26 18:02 ` Samuel Just
2016-05-26 18:17 ` Jason Dillaman
2016-05-26 18:49 ` Somnath Roy
2016-05-26 18:52 ` Jason Dillaman
2016-05-28 7:29 ` Alexandre DERUMIER
2016-05-28 16:23 ` Somnath Roy
2016-05-31 19:57 ` Jason Dillaman [this message]
2016-06-01 6:58 ` Alexandre DERUMIER
2016-05-26 2:01 ` Haomai Wang
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