[Xen-users] Difference performances between HVM and PV guest in hard disc reading

[helicoterus-elih@xxxxxxxx]

I perform some tests to get hard disc performance differences between HVM domU 
and a paravirtualized one (both Debian Lenny).
I used hdparm ( option -t and -T) to test cache of disc and disc sequential 
read.
Syntax is:
hdparm -t|-T /dev/hda1

hdparm -t for hvm returns about 30 MB/sec, wheras hdparm -t for PV return about 
180 MB/sec.
hdparm -T for hvm returns about 1247 MB/sec, wheras hdparm -T for PV return 
about 1183 MB/sec.

Are this test true? What about this differences? Why are hard disc performances 
so different?

Thanks





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