[Xen-devel] Re: [Xen-users] cache for partition based VBD?

[Tim Freeman <tfreeman@xxxxxxxxxxx>]

On Tue, 29 Nov 2005 18:56:32 +0100
"Petersson, Mats" <mats.petersson@xxxxxxx> wrote:
[...]
> > I think that the Linux architecture puts the buffer cache in 
> > front of all block device access, not at the VFS layer.  So 
> > does that answer the question?  The dom0 disk backend driver 
> > sits "above" the buffer cache?  (sorry for my crude
> > understanding)
> 
> I would say that this is correct - the Dom0 disk driver would have a
> cache in itself, and the DomU would also have a caching layer. But I'm
> not SURE about this at all. 
> 
> If someone can make further comments, it would be great. 

I found this post that directly addresses the point:

http://lists.xensource.com/archives/html/xen-devel/2005-05/msg01167.html

(now the experimental data makes less sense to me)

Tim 


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