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