read from /dev/sdc (qlogic FC, 36GB 15k disk) with O_DRIECT enabled with iostat output

					iostat -x 5
		  -----------------------------------------------------------------------------------------------------
cfg   reqsize     rrqm/s wrqm/s   r/s   w/s   rsec/s   wsec/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %util
---	----	  ----	
xenU	  4k 	  0.00   0.00 100.00   0.00  800.00    0.00   400.00     0.00     8.00     1.00   10.00  10.00 100.00 <-from dom0
		  0.00   0.00 100.00   0.00  800.00    0.00   400.00     0.00     8.00     1.00   10.00  10.00 100.00 <-from domU

xenU	 40k	900.00   0.00 100.00   0.00 8000.00    0.00  4000.00     0.00    80.00     1.00   10.00  10.00 100.00 <-from dom0
		  0.00   0.00  98.60   0.00 7888.00    0.00  3944.00     0.00    80.00     1.00   10.14  10.14 100.00 <-from domU

xenU    400k   9900.00   0.00 100.00   0.00 80000.00    0.00 40000.00     0.00   800.00     1.00   10.00  10.00 100.00 <-from dom0
		  0.00   0.00 1000.00  0.00 80000.00    0.00 40000.00     0.00    80.00    10.00   10.00   1.00 100.00 <-from domU

xenU   4000k  14512.60   0.00 146.40  0.00 117273.60    0.00 58636.80     0.00   801.05     4.57   31.16   6.83 100.00 <-from dom0
	   	  0.00   0.00 1328.60 0.00 116800.00    0.00 58400.00     0.00    87.91    50.69   38.15   0.75  99.80 <-from domU

xen0	  4k      0.00   0.00 5883.60  0.00 47068.80    0.00 23534.40     0.00     8.00     0.99    0.17   0.17  98.60

xen0	 40k	  0.00   0.00 1452.20  0.00 116160.00   0.00 58080.00     0.00    79.99     1.00    0.69   0.69  99.60

xen0	400k      0.00   0.00 145.00  0.00 116000.00    0.00 58000.00     0.00   800.00     1.00    6.88   6.88  99.80

xen0   4000k	  0.00   0.00 116.40  0.00 115200.00    0.00 57600.00     0.00   989.69     4.54   38.93   8.59 100.00