Database Reference
In-Depth Information
Figure 7.5
Dispelling the myth surrounding TPS.
Mem.ShareScanTime specifies the time in minutes within which an entire virtual
machine is scanned for page-sharing opportunities. The default setting is 60 minutes. So
even when this happens six times an hour, the overhead is minimal.
Tip
To learn more about this study and why you do not want to disable transparent
page sharing, review the performance study from VMware titled “Understanding
Memory Resource Management in VMware vSphere 5.0.” The URL is
Best Practice
We recommend that you keep the default setting for Mem.ShareScanTime and do
not disable transparent page sharing. This is a far more efficient way to deal with
memory constraints than the alternative of paging and swapping.
Memory Ballooning
Transparent page sharing is a process that is constantly running on the hypervisor when
there are spare CPU cycles, looking for opportunities to reclaim memory. Ballooning is
a memory-reclamation technique that only kicks in when the physical host is running low
