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RE: [Xen-devel] Bad read performance

from [Ian Pratt]

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To:	"Pradheep K E" <pradheep.ke@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-devel] Bad read performance
From:	"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date:	Sat, 26 Feb 2005 21:04:56 -0000
Cc:	<ian.pratt@xxxxxxxxxxxx>
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Thread-topic:	[Xen-devel] Bad read performance

> 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


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