Maybe this is related to the changes done in ZBX-5970 or ZBXNEXT-2225.
Is the Windows running in virtualized environment?
Could you please tell the result of system.swap.size[,total] and the real swap file and physical memory sizes on this system?
Yes, it is a VMWare ESXi virtualized Windows.
system.swap.size[,total] = 510.18 MB
Thanks, and the real swap/memory sizes ?
Memory: 8,588,886,016 Bytes
Swap (Pagefile.sys on disk): 536,870,912 Bytes
You're welcome 
Thanks, we had some weird results returned by Windows GlobalMemoryStatus*() functions in virtual environmnet (ESXi and VirtualBox). We will investigate it further.
After some testing I can confirm that in virtualized environments Windows is reporting memory usage values which I cannot currently explain.
When monitoring Available Bytes, Committed Bytes, Commit Limit one would expect that page file usage to be calculated as:
Physical Memory Used = Physical Memory Total - Available Bytes Swap Used = Committed Bytes - Physical Memory Used Swap Used % = 100 * Swap Used / Swap Total
In non virtualized environment it matches the pagefile usage % performance counter, while on virtualized systems the difference can be quite large.
(1) So currently we suggest using performance counters to obtain swap file statistics on virtualized Windows platforms.
The documentation was updated accordingly, please review:
- https://www.zabbix.com/documentation/1.8/manual/config/items
- https://www.zabbix.com/documentation/2.0/manual/config/items/itemtypes/zabbix_agent
- https://www.zabbix.com/documentation/2.2/manual/config/items/itemtypes/zabbix_agent
- https://www.zabbix.com/documentation/2.4/manual/config/items/itemtypes/zabbix_agent
- https://www.zabbix.com/documentation/3.0/manual/config/items/itemtypes/zabbix_agent
sasha CLOSED
have the same issue on Zabbix 3.2, windows server 2012r2, esxi 6.0u2
Free swap space reporting 0 on system.swap.size[,free] and perf_counter[\700(_Total)\702]