[Xen-tools] Information from xm top is wrong

[jbuy0710 <juby0710@xxxxxxxxx>]

First, I create a new HVM via virtual manager or using “xm new”
according to a config file.

Second, I log in this VM, and do something EX: using dd to create a file.

Third, I use xm top to see the I/O information of this guest, and it
always show 0 as below

I also tried to use ping or wget in VM, and the information from xm
top is shown as below
  Net0 RX:        0bytes        0pkts        0err        0drop  TX:
3714bytes       45pkts        0err    71144drop
  VBD BlkBack  768 [ 3: 0]  OO:        0   RD:        0   WR:        0
  RSECT:          0   WSECT:          0

1.  We can find the block information shown above are all zero.
2.  TX only increase when booting. When OS is launched, only drop increase.

I tried to install a para-virtualized VM before, and all information
is correct as below
Net0 RX:     1198bytes       12pkts        0err        0drop
TX:2260bytes       29pkts        0err        1drop
VBD BlkBack 51712 [ca: 0]  OO:        0   RD:     7066   WR:     2145
RSECT:     396393   WSECT: 26706

It's a bug or xm top only supports para-virtualized VM?
How to monitor block device and network of full-virtualized DOM-U, if
xm top only supports para-virtualized VM?

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