Slow io perfomance on domU

I 've installed Oracle VM server + Oracle VM manager 2.2 for test purposes
on domU installed fully virtualized OEL 64 5.2
Additionaly I attached hard disk, in vm.cfg I added 'phy:/dev/cciss/c0d1p1,sda,w'
Copy speed on Dom0 to this disk equals to 15MB/s
Copy speed on DomU (guest OS) to this disk equals to 30-35MB/s
What to do?
in DOM0:
[root@xen ~]# hdparm -tT /dev/cciss/c0d1
/dev/cciss/c0d1:
Timing cached reads: 21296 MB in 1.99 seconds = 10682.28 MB/sec
Timing buffered disk reads: 344 MB in 3.01 seconds = 114.33 MB/sec
in DOMU:
hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 23576 MB in 1.99 seconds = 11818.12 MB/sec
Timing buffered disk reads: 60 MB in 3.09 seconds = 19.44 MB/sec

The man page for hdparm suggests that you should repeat the operation several times to get an accurate output.
I tried same command on a virtualized system and got increasing results each time:
# hdparm -tT /dev/hdb
/dev/hdb:
Timing cached reads:   24008 MB in  2.00 seconds = 12030.97 MB/sec
Timing buffered disk reads:  250 MB in  3.12 seconds =  80.21 MB/sec
# hdparm -tT /dev/hdb
/dev/hdb:
Timing cached reads:   24788 MB in  2.00 seconds = 12422.37 MB/sec
Timing buffered disk reads:  360 MB in  3.04 seconds = 118.27 MB/sec
# hdparm -tT /dev/hdb
/dev/hdb:
Timing cached reads:   24488 MB in  2.00 seconds = 12272.63 MB/sec
Timing buffered disk reads:  472 MB in  3.03 seconds = 155.72 MB/sec
# hdparm -tT /dev/hdb
/dev/hdb:
Timing cached reads:   22924 MB in  2.00 seconds = 11487.01 MB/sec
Timing buffered disk reads:  514 MB in  3.27 seconds = 157.40 MB/sec
# hdparm -tT /dev/hdb
/dev/hdb:
Timing cached reads:   24116 MB in  2.00 seconds = 12084.59 MB/sec
Timing buffered disk reads:  550 MB in  3.04 seconds = 181.13 MB/sec
# hdparm -tT /dev/hdb
/dev/hdb:
Timing cached reads:   24260 MB in  2.00 seconds = 12155.17 MB/sec
Timing buffered disk reads:  582 MB in  3.01 seconds = 193.07 MB/sec
# hdparm -tT /dev/hdb
/dev/hdb:
Timing cached reads:   22980 MB in  2.00 seconds = 11512.45 MB/sec
Timing buffered disk reads:  612 MB in  3.12 seconds = 196.05 MB/sec

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