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Re: [Qemu-devel] buffer alignment for block backends
From: |
Stefano Stabellini |
Subject: |
Re: [Qemu-devel] buffer alignment for block backends |
Date: |
Thu, 09 Apr 2009 16:46:38 +0100 |
User-agent: |
Thunderbird 2.0.0.14 (X11/20080505) |
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.
>
Samuel is right, I was misled by my test environment.
Blkfront does support sector aligned buffers (even though at the moment
they don't work for me :P ).
- [Qemu-devel] buffer alignment for block backends, Stefano Stabellini, 2009/04/08
- Re: [Qemu-devel] buffer alignment for block backends, Anthony Liguori, 2009/04/08
- Re: [Qemu-devel] buffer alignment for block backends, Stefano Stabellini, 2009/04/09
- 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 <=
- 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, 2009/04/09
- 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