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Re: [Qemu-devel] buffer alignment for block backends

From: Jamie Lokier
Subject: Re: [Qemu-devel] buffer alignment for block backends
Date: Thu, 9 Apr 2009 16:55:50 +0100
User-agent: Mutt/1.5.13 (2006-08-11)

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?

-- Jamie

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