[Xen-devel] Information from xm top is wrong

[<wenche_chang@xxxxxxxxxxxx>]

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 like calculating MD5 or 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 is 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 domU of full-virtualized VM, if xm top only supports para-virtualized VM?

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