Xen devel - Jul 2010 - Get different memory value of Xen dom0 by "xm top" and "top"

Hello everyone,

My Xen Version is  xen-4.0.0

When I use "xm top"  to get the dom0 memory allocation, I got
following result :   domain0 memory allocation: 1177508,

 

xentop - 12:24:17   Xen 4.0.0

5 domains: 1 running, 4 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown

Mem: 41879780k total, 41845196k used, 34584k free    CPUs: 8 @ 2533MHz

      NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) VCPUS
NETS NETTX(k) NETRX(k) VBDS

VBD_OO   VBD_RD   VBD_WR  VBD_RSECT  VBD_WSECT SSID

    centOS --b---         27    1.6   10489824   25.0   10489856      25.0     1
0        0        0    1

     0        0        0          0          0    0

   centOS4 --b---          8    1.5    8392672   20.0    8392704      20.0     1
1        0        0    1

     0        0        0          0          0    0

  Domain-0 -----r        184   11.5    1177508    2.8   no limit       n/a     8
0        0        0    0

     0        0        0          0          0    0

   win2003 --b---          8    0.2   10489824   25.0   10489856      25.0     1
1        0        0    1

     0        0        0          0          0    0

     winxp --b---          7    0.2   10489824   25.0   10489856      25.0     1
1        0        0    1

     0        0        0          0          0    0

 

 

But I got a different result different result by using "top" to see
the dom0 memory status:

 

top - 12:24:48 up 16 min,  5 users,  load average: 0.52, 0.38, 0.22

Tasks: 226 total,   3 running, 223 sleeping,   0 stopped,   0 zombie

Cpu(s):  0.5%us,  0.8%sy,  0.0%ni, 96.4%id,  2.2%wa,  0.0%hi,  0.0%si,  0.1%st

Mem:   1960880k total,  1922052k used,    38828k free,     6528k buffers

Swap: 51199992k total,        0k used, 51199992k free,   272924k cached

 

 

 

where "xm top" get    1177508k   but "top" get    1960880k  
on the test, about 7xx MB different.

Meanwhile, I also got a similar difference(~7xx MB) on another machine running
same test using xen-4.0.0,  with  3342336 by "xm top"  and 4096944 by
"top"

 

But on the other hand, I got an equal result on Xen-3.X version

 

 

Anyone idea is welcome

Thanks!

 

Best regards,

Ben

 

 

 

 

 

 

 

 

 

 


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