Den 01.04.2019 11:34, skrev Kevin Wolf:
Yes, for 512 accesses on native 4k disks with O_DIRECT, the QEMU block
layer performs the necessary RMW. Of course, it still comes with a
performance penalty, so you want to avoid such setups, but they do work.
I suspect that the approximately 1/10 -th
> -Original Message-
[snip]
> > >
> > > The old implementation has the sector size hardcoded:
> > >
> > > #define BLOCK_SIZE 512
> > >
> > > Whereas the qdevified version uses DEFINE_BLOCK_PROPERTIES(), which
> > > includes user-visible options for logical/physical_block_size.
> > >
>
roject.org; qemu-bl...@nongnu.org; qemu-de...@nongnu.org;
> > Stefano Stabellini
> > ; Max Reitz ; Stefan Hajnoczi
> >
> > Subject: Re: [Xen-devel] [PATCH v2 0/2] xen-block: fix sector size confusion
> >
> > Am 28.03.2019 um 12:46 hat Andrew Cooper geschrieben:
Max Reitz ; Stefan Hajnoczi
>
> Subject: Re: [Xen-devel] [PATCH v2 0/2] xen-block: fix sector size confusion
>
> Am 28.03.2019 um 12:46 hat Andrew Cooper geschrieben:
> > On 28/03/2019 11:40, Anthony PERARD wrote:
> > > On Wed, Mar 27, 2019 at 08:32:28PM +0
r
> >>> Sent: 27 March 2019 18:20
> >>> To: Paul Durrant ;
> >>> xen-devel@lists.xenproject.org; qemu-bl...@nongnu.org;
> >>> qemu-de...@nongnu.org
> >>> Cc: Kevin Wolf ; Stefano Stabellini
> >>> ; Max Reitz
> >>> ; S
:20
> >>> To: Paul Durrant ;
> >>> xen-devel@lists.xenproject.org; qemu-bl...@nongnu.org;
> >>> qemu-de...@nongnu.org
> >>> Cc: Kevin Wolf ; Stefano Stabellini
> >>> ; Max Reitz
> >>> ; Stefan Hajnoczi ; Anthony
> >>
>>> qemu-bl...@nongnu.org;
>>> qemu-de...@nongnu.org
>>> Cc: Kevin Wolf ; Stefano Stabellini
>>> ; Max Reitz
>>> ; Stefan Hajnoczi ; Anthony Perard
>>>
>>> Subject: Re: [Xen-devel] [PATCH v2 0/2] xen-block: fix sector size confusion
>>>
; > Cc: Kevin Wolf ; Stefano Stabellini
> > ; Max Reitz
> > ; Stefan Hajnoczi ; Anthony Perard
> >
> > Subject: Re: [Xen-devel] [PATCH v2 0/2] xen-block: fix sector size confusion
> >
> > On 27/03/2019 17:32, Paul Durrant wrote:
> > > The Xen blkif p
ard
>
> Subject: Re: [Xen-devel] [PATCH v2 0/2] xen-block: fix sector size confusion
>
> On 27/03/2019 17:32, Paul Durrant wrote:
> > The Xen blkif protocol is confusing but discussion with the maintainer
> > has clarified that sector based quantities in requests and th
On 27/03/2019 17:32, Paul Durrant wrote:
> The Xen blkif protocol is confusing but discussion with the maintainer
> has clarified that sector based quantities in requests and the 'sectors'
> value advertized in xenstore should always be in terms of 512-byte
> units and not the advertised logical 's
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