1 : Initial run No change to the balloon 

Total Memory = Balloon 1024 Mo

Data from vdsClient getVmStats

   balloonInfo = {'balloon_max': '1048576', 'balloon_min': '131072', 'balloon_target': '1048576', 'balloon_cur': '1048576'}

   memoryStats = {'swap_out': '0', 'majflt': '0', 'mem_free': '920308', 'swap_in': '0', 'pageflt': '7', 'mem_total': '1020576', 'mem_unused': '863500'}

 

   Here : mem_total - mem_unused = 157076 correct

Data get from api (REST or Python : statistics.'memory.used') 

Memory used 128849018.0  = 123 Mo

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If i modify the balloon by the command vdsClient setBalloonTarget 524288 (512*1024)

i got

  vds

  balloonInfo = {'balloon_max': '1048576', 'balloon_min': '131072', 'balloon_target': '524288', 'balloon_cur': '524288'}

  memoryStats = {'swap_out': '0', 'majflt': '0', 'mem_free': '396044', 'swap_in': '0', 'pageflt': '7', 'mem_total': '496288', 'mem_unused': '339228'}

  

   mem_total - mem_unused = 157076 correct value

  API.statistics

Memory used = 665719930.0 = 635 Mo ==> (512+123)

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Setting a balloon to 262144 (256*1024)

balloonInfo = {'balloon_max': '1048576', 'balloon_min': '131072', 'balloon_target': '262144', 'balloon_cur': '262144'}

memoryStats = {'swap_out': '0', 'majflt': '0', 'mem_free': '133916', 'swap_in': '0', 'pageflt': '6', 'mem_total': '234144', 'mem_unused': '76224'}

        mem_total - mem_unused = correct value

API.statistics:

Memory used = 934155386.0 = 891 Mo (768+123)