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From: Stefan Hajnoczi <stefanha@redhat.com>
To: Ming Lei <tom.leiming@gmail.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>,
	"Richard W.M. Jones" <rjones@redhat.com>,
	io-uring@vger.kernel.org, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Kirill Tkhai <kirill.tkhai@openvz.org>,
	Manuel Bentele <development@manuel-bentele.de>,
	qemu-devel@nongnu.org, Kevin Wolf <kwolf@redhat.com>,
	Xie Yongji <xieyongji@bytedance.com>,
	"Denis V. Lunev" <den@openvz.org>,
	Stefano Garzarella <sgarzare@redhat.com>
Subject: Re: ublk-qcow2: ublk-qcow2 is available
Date: Thu, 13 Oct 2022 12:01:10 -0400	[thread overview]
Message-ID: <Y0g2Rg9nAU5grjCV@fedora> (raw)
In-Reply-To: <Y0du/9K3II70tZTD@T590>

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On Thu, Oct 13, 2022 at 09:50:55AM +0800, Ming Lei wrote:
> On Wed, Oct 12, 2022 at 10:15:28AM -0400, Stefan Hajnoczi wrote:
> > On Thu, 6 Oct 2022 at 06:14, Richard W.M. Jones <rjones@redhat.com> wrote:
> > >
> > > On Tue, Oct 04, 2022 at 09:53:32AM -0400, Stefan Hajnoczi wrote:
> > > > qemu-nbd doesn't use io_uring to handle the backend IO,
> > >
> > > Would this be fixed by your (not yet upstream) libblkio driver for
> > > qemu?
> > 
> > I was wrong, qemu-nbd has syntax to use io_uring:
> > 
> >   $ qemu-nbd ... --image-opts driver=file,filename=test.img,aio=io_uring
> 
> Yeah, I saw the option, previously when I tried io_uring via:
> 
> qemu-nbd -c /dev/nbd11 -n --aio=io_uring $my_file
> 
> It complains that 'qemu-nbd: Invalid aio mode 'io_uring'' even though
> that 'qemu-nbd --help' does say that io_uring is supported.
> 
> Today just tried it on Fedora 37, looks it starts working with
> --aio=io_uring, but the IOPS is basically same with --aio=native, and
> IO trace shows that io_uring is used by qemu-nbd.

Okay, similar performance to Linux AIO is expected. That's what we've
seen with io_uring in QEMU. QEMU doesn't use io_uring in polling mode,
so it's similar to what we get with Linux AIO.

Stefan

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  reply	other threads:[~2022-10-13 16:01 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-30  9:24 ublk-qcow2: ublk-qcow2 is available Ming Lei
2022-10-03 19:53 ` Stefan Hajnoczi
2022-10-03 23:57   ` Denis V. Lunev
2022-10-05 15:11     ` Stefan Hajnoczi
2022-10-06 10:26       ` Ming Lei
2022-10-06 13:59         ` Stefan Hajnoczi
2022-10-06 15:09           ` Ming Lei
2022-10-06 18:29             ` Stefan Hajnoczi
2022-10-07 11:21               ` Ming Lei
2022-10-04  9:43   ` Ming Lei
2022-10-04 13:53     ` Stefan Hajnoczi
2022-10-05  4:18       ` Ming Lei
2022-10-05 12:21         ` Stefan Hajnoczi
2022-10-05 12:38           ` Denis V. Lunev
2022-10-06 11:24           ` Ming Lei
2022-10-07 10:04             ` Yongji Xie
2022-10-07 10:51               ` Ming Lei
2022-10-07 11:21                 ` Yongji Xie
2022-10-07 11:23                   ` Ming Lei
2022-10-08  8:43         ` Ziyang Zhang
2022-10-12 14:22           ` Stefan Hajnoczi
2022-10-13  6:48             ` Yongji Xie
2022-10-13 16:02               ` Stefan Hajnoczi
2022-10-14 12:56               ` Ming Lei
2022-10-17 11:11                 ` Yongji Xie
2022-10-18  6:59                   ` Ming Lei
2022-10-18 13:17                     ` Yongji Xie
2022-10-18 14:54                       ` Stefan Hajnoczi
2022-10-19  9:09                         ` Ming Lei
2022-10-24 16:11                           ` Stefan Hajnoczi
2022-10-21  5:33                         ` Yongji Xie
2022-10-21  6:30                           ` Jason Wang
2022-10-25  8:17                             ` Yongji Xie
2022-10-25 12:02                               ` Stefan Hajnoczi
2022-10-28 13:33                                 ` Yongji Xie
2022-11-01  2:36                                 ` Jason Wang
2022-11-02 19:13                                   ` Stefan Hajnoczi
2022-11-04  6:55                                     ` Jason Wang
2022-10-21  6:28                     ` Jason Wang
2022-10-06 10:14       ` Richard W.M. Jones
2022-10-12 14:15         ` Stefan Hajnoczi
2022-10-13  1:50           ` Ming Lei
2022-10-13 16:01             ` Stefan Hajnoczi [this message]
2022-10-04  5:43 ` Manuel Bentele

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