Re: [Xen-users] Differences in performance between file and LVM based images

[Adrian Chadd <adrian@xxxxxxxxxxxxxxx>]

On Fri, Aug 25, 2006, Alex Iribarren wrote:

> I'm aware of the fact that 900MB files will be cached, specially on a
> machine as powerful and idle as this. However, I was trying to measure
> the performance I could "realistically" get, not the overhead of LVM vs.
> files vs. direct access.
> 
> Having said that, I invite you (everybody, not just you) to continue
> with these kind of benchmarks. If you test the actual overhead of each
> system and manage to eliminate all the caching, I'd be interested in
> seeing your results.

Hm! Does going via the loop device invoke O_DIRECT semantics?
Does it end up caching the FS data in dom0 (and then double-caching
it again in the domU) ?




Adrian


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