Bad read performance

Bad read performance

[Pradheep K E]

Hi,

I notice that domain 0 gives bad performance with disk I/O. Domain 0
was given about 55MB RAM. With the same configuration, Linux on raw
hardware gives far better performance. While a raw Linux OS gives a
disk read throughput of around 20MB/sec (without any caching effects),
dom0 (using the Xen.2.0.4 kernel with linux kernel 2.6.10) gives only
about 2-3MB/sec throughput.

Any pointers to the reasons for this difference will be greatly helpful. 

Thanks,
pradheep.


-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click

RE: Bad read performance

[Ian Pratt]

> I notice that domain 0 gives bad performance with disk I/O. Domain 0
> was given about 55MB RAM. With the same configuration, Linux on raw
> hardware gives far better performance. While a raw Linux OS gives a
> disk read throughput of around 20MB/sec (without any caching effects),
> dom0 (using the Xen.2.0.4 kernel with linux kernel 2.6.10) gives only
> about 2-3MB/sec throughput.
> 
> Any pointers to the reasons for this difference will be 
> greatly helpful. 

Your dom0 kernel probably does not have the proper driver for you disk
controller compiled in...

Ian


-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_ide95&alloc_id\x14396&op=click