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Re: [Qemu-devel] buffer alignment for block backends
From: |
Samuel Thibault |
Subject: |
Re: [Qemu-devel] buffer alignment for block backends |
Date: |
Thu, 9 Apr 2009 18:15:16 +0200 |
User-agent: |
Mutt/1.5.12-2006-07-14 |
Jamie Lokier, le Thu 09 Apr 2009 16:55:50 +0100, a écrit :
> Samuel Thibault wrote:
> > Gerd Hoffmann, le Thu 09 Apr 2009 15:54:34 +0200, a écrit :
> > > On 04/09/09 15:30, Stefano Stabellini wrote:
> > > >The userspace\kernelspace distinction does not make much sense in
> > > >minios, but yes it provides an interface to communicate with blkback in
> > > >dom0. This interface is used by block-vbd in qemu instead of
> > > >block-raw-posix when run in minios.
> > >
> > > Sit back, look again. Do you really need it being page-aligned?
> >
> > Page aligned is an optimization which comes for free when you can
> > already choose the alignment.
> >
> > > The xen block protocol can handle unaligned requests just fine.
> >
> > Not completely arbitrarily aligned requests. They need to be
> > sector-aligned.
>
> Thought about 4k sectors, to be found in new disks sometime soon?
Same wording: they will have to be sector-aligned (the blkback announces
the size of its sector).
Samuel
- Re: [Qemu-devel] buffer alignment for block backends, (continued)
- Re: [Qemu-devel] buffer alignment for block backends, Anthony Liguori, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Stefano Stabellini, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Gerd Hoffmann, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Samuel Thibault, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Stefano Stabellini, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Gerd Hoffmann, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Stefano Stabellini, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Samuel Thibault, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Anthony Liguori, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Jamie Lokier, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends,
Samuel Thibault <=
- Re: [Qemu-devel] buffer alignment for block backends, Lennart Sorensen, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Stefano Stabellini, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Samuel Thibault, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Paul Brook, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Samuel Thibault, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Anthony Liguori, 2009/04/09
- Re: [Qemu-devel] buffer alignment for block backends, Samuel Thibault, 2009/04/09
Re: [Qemu-devel] buffer alignment for block backends, Stefano Stabellini, 2009/04/09