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From: Stefan Hajnoczi <[email protected]>
To: Jason Wang <[email protected]>
Cc: Stefan Hajnoczi <[email protected]>,
	Yongji Xie <[email protected]>,
	"Michael S. Tsirkin" <[email protected]>,
	Ming Lei <[email protected]>,
	Ziyang Zhang <[email protected]>,
	[email protected], [email protected],
	linux-kernel <[email protected]>,
	"Denis V. Lunev" <[email protected]>,
	Xiaoguang Wang <[email protected]>
Subject: Re: ublk-qcow2: ublk-qcow2 is available
Date: Wed, 2 Nov 2022 15:13:47 -0400	[thread overview]
Message-ID: <Y2LBa/ePKiSN2phm@fedora> (raw)
In-Reply-To: <CACGkMEt+BWCUVQPnfUUd0QXkHz=90LMXxydCgBqWTDB3eGBw-w@mail.gmail.com>

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On Tue, Nov 01, 2022 at 10:36:29AM +0800, Jason Wang wrote:
> On Tue, Oct 25, 2022 at 8:02 PM Stefan Hajnoczi <[email protected]> wrote:
> >
> > On Tue, 25 Oct 2022 at 04:17, Yongji Xie <[email protected]> wrote:
> > >
> > > On Fri, Oct 21, 2022 at 2:30 PM Jason Wang <[email protected]> wrote:
> > > >
> > > >
> > > > 在 2022/10/21 13:33, Yongji Xie 写道:
> > > > > On Tue, Oct 18, 2022 at 10:54 PM Stefan Hajnoczi <[email protected]> wrote:
> > > > >> On Tue, 18 Oct 2022 at 09:17, Yongji Xie <[email protected]> wrote:
> > > > >>> On Tue, Oct 18, 2022 at 2:59 PM Ming Lei <[email protected]> wrote:
> > > > >>>> On Mon, Oct 17, 2022 at 07:11:59PM +0800, Yongji Xie wrote:
> > > > >>>>> On Fri, Oct 14, 2022 at 8:57 PM Ming Lei <[email protected]> wrote:
> > > > >>>>>> On Thu, Oct 13, 2022 at 02:48:04PM +0800, Yongji Xie wrote:
> > > > >>>>>>> On Wed, Oct 12, 2022 at 10:22 PM Stefan Hajnoczi <[email protected]> wrote:
> > > > >>>>>>>> On Sat, 8 Oct 2022 at 04:43, Ziyang Zhang <[email protected]> wrote:
> > > > >>>>>>>>> On 2022/10/5 12:18, Ming Lei wrote:
> > > > >>>>>>>>>> On Tue, Oct 04, 2022 at 09:53:32AM -0400, Stefan Hajnoczi wrote:
> > > > >>>>>>>>>>> On Tue, 4 Oct 2022 at 05:44, Ming Lei <[email protected]> wrote:
> > > > >>>>>>>>>>>> On Mon, Oct 03, 2022 at 03:53:41PM -0400, Stefan Hajnoczi wrote:
> > > > >>>>>>>>>>>>> On Fri, Sep 30, 2022 at 05:24:11PM +0800, Ming Lei wrote:
> > There are ways to minimize that cost:
> > 1. The driver only needs to fetch the device's sq index when it has
> > run out of sq ring space.
> > 2. The device can include sq index updates with completions. This is
> > what NVMe does with the CQE SQ Head Pointer field, but the
> > disadvantage is that the driver has no way of determining the sq index
> > until a completion occurs.
> 
> Probably, but as replied in another thread, based on the numbers
> measured from the networking test, I think the current virtio layout
> should be sufficient for block I/O but might not fit for cases like
> NFV.

I remember that the Linux virtio_net driver doesn't rely on vq spinlocks
because CPU affinity and the NAPI architecture ensure that everything is
CPU-local. There is no need to protect the freelist explicitly because
the functions cannot race.

Maybe virtio_blk can learn from virtio_net...

Stefan

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  reply	other threads:[~2022-11-02 19:15 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 [this message]
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
2022-10-04  5:43 ` Manuel Bentele

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