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[Xen-devel] Bad read performance

To: xen-devel@xxxxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Bad read performance
From: Pradheep K E <pradheep.ke@xxxxxxxxx>
Date: Sat, 26 Feb 2005 01:00:23 -0600
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Reply-to: Pradheep K E <pradheep.ke@xxxxxxxxx>
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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.


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