Performance Tweaks
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Note: Article about Proxmox VE 2.0 |
Introduction
This page is intended to be a collection of various performance tips/tweaks to help you get the most from your virtual servers.
KVM
Disk Cache
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Note: The information below is based on using raw volumes, other volume formats may behave differently. |
cache=none seems to be the best performance and is the default in Proxmox 2.X.
cache=directsync seems similar in performance to cache=none
cache=writethrough should help speed up reads since it can use the host disk cache for reads but in practice it performs worse than cache=none
cache=writeback should help with reads and writes at the risk of loosing data, in practice it performs worse than cache=none.
caching adds additional data copies and bus traffic causing it to perform worse.
Application Specific Tweaks
Microsoft SQL Server
Trace Flag T8038
Setting the trace flag -T8038 will drastically reduce the number of context switches when running SQL 2005 or 2008.
To change the trace flag:
- Open the SQL server Configuration Manager
- Open the properties for the SQL service typically named MSSQLSERVER
- Go to the advanced tab
- Append ;-T8038 to the end of the startup parameters option
For additional references see: Proxmox forum