[Xen-devel] Re: Loopback Performance (Was Re: Disk naming)

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Mark Williamson wrote:

> On Friday 15 April 2005 23:11, Anthony Liguori wrote:
>  
>
> I'm sorry but I don't follow this.  The inodes for the filesystem inside it 
> only need to be looked up by the guest filesystem driver.  The inode for the 
> disk file only needs to be looked up once in dom0 when the file is opened 
> (the metadata will then be cached).  Am I missing something?
>  
I meant looking up the data blocks in the inode.  You may be hitting 
triple-indirect blocks twice.
I don't know enough about the kernel level caching to say anything 
definitive.  I do have some ideas who to ask though.
Regards,
Anthony Liguori

> The data you've collected are interesting though.  I wonder if searching the 
> LKML archives might yield any interesting discussion about the loop device's 
> behaviour.
> Cheers,
> Mark
>  

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