[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
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 17:19:44 +0200 |
User-agent: |
Mutt/1.5.12-2006-07-14 |
Anthony Liguori, le Thu 09 Apr 2009 08:11:27 -0500, a écrit :
> >- ide.c:ide_init2
> >
>
> This buffer is only used when not doing DMA. When doing DMA, we are
> able to do zero-copy IO so the alignment of the request depends on how
> the guest aligned the request. I suspect you'll find a lot of guests
> that, in practice, do not align requests at 4k boundaries.
Eeeeerrr, why shoudn't they? Guests usually work on pages, which are
already aligned on 4k boundaries.
> I don't know what the requirements are for IDE but I would be
> surprised if it was 4k.
I believe there is no requirement.
Samuel
- Re: [Qemu-devel] buffer alignment for block backends, (continued)
- 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, 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 <=
- 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
Re: [Qemu-devel] buffer alignment for block backends, Christoph Hellwig, 2009/04/09
Re: [Qemu-devel] buffer alignment for block backends, Stefano Stabellini, 2009/04/09
Re: [Qemu-devel] buffer alignment for block backends, Christoph Hellwig, 2009/04/09