[Xen-users] Windows Disk performance

[Ruslan Sivak <russ@xxxxxxxxxx>]

I've been getting disappointing results on IO reads when using windows 
guests.  I'm getting usually around 70MB/s reads using hdtune.  When 
installing James' PV drivers, the speed drops to about 20MB/s. 

The host system is getting around 350MB/s reads.  I'm wondering if there 
is such a significant slowdown, or if my tests are somehow flawed.  The 
70MB/s persisted throughout my VM testing, whether I was using Xen, 
XenSource or VMWare Server. 

So my questions are:

a.  Is there a bottleneck somewhere which basically caps the windows 
disk performance?
b. Is my testing methodology flawed.  Is there a better windows tool 
that will measure performance?  What about Linux tool?  I'm currently 
using hdparm -t
Russ




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