Transparent Page Sharing a virtualizacia Terminal Server

Vyznam vypnutia Transparent Page Sharing pri virtualizovani Microsoft Terminal Server:

Transparent Page Sharing

vSphere’s ability to overcommit VM memory and memory de-duplication through transparent page sharing (TPS) is highly useful for the consolidation of many VMs onto a single server. Nevertheless, one of the older Terminal Server best practices floating around the Internet communities was to disable TPS. And in fact Project VRC phase 1 showed that disabling TPS actually improved performance by 5-10%. This makes sense since TPS is made possible via a background process which scans and reallocates memory, consuming a modest amount of CPU in the process.

When it is the primary objective to maximize the amount of users with Terminal Server workloads and there is enough physical memory available, we still recommend disabling TPS. As a result, all Project VRC tests were conducted with TPS disabled, unless stated otherwise.

However, this VRC recommendation should not be understood as an overall recommendation to disable TPS. For instance, when the main goal is to maximize the number of VMs is (which is quite common, e.g. VDI and rather typical server consolidation efforts), TPS can be very helpful and is recommended.

Zdroj: http://www.brianmadden.com/blogs/jeroenvandekamp/archive/2010/01/09/best-practices-for-virtualizing-terminal-servers-from-project-vrc-phase-2.aspx