Re: [Xen-devel] File System Performance - 10x slower

[Steven Hand <Steven.Hand@xxxxxxxxxxxx>]

> I am evaluating File I/O performance using Xen & comparing it with
> baseline (Fedora Core 3, with 2.6.9 kernel).
>
[snip poor I/O results]
>
> Can someone why I am getting such huge difference in performance
> compared to baseline ??

What version of Xen are you using? 2.0.x [preferably 2.0.3]? 

Did you move /lib/tls out of the way on the various root filesystems? 

I ask since it should be almost *impossible* to get anything more 
than a very small % slowdown on disk I/O unless things are very 
broken -- most of our benchmarks to date show 0% slowdown (and 
in some cases involving domU, a speedup due to additional buffering). 


Can you post the output of Xen / dom0 / domU booting, and your
configuration files? 


cheers,

S.




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