forgot to delete, thank you scoof

doc/sphinx/tutorial/virtualised.rst

-
-Running Varnish in a virtualized environment
---------------------------------------------
-
-It is possible, but not recommended for high performance, to run
-Varnish on virtualised hardware. Reduced disk- and network performance
-will reduce the performance a bit so make sure your system has good IO
-performance.
-
-OpenVZ
-~~~~~~
-
-If you are running on 64bit OpenVZ (or Parallels VPS), you must reduce
-the maximum stack size before starting Varnish. The default allocates
-to much memory per thread, which will make varnish fail as soon as the
-number of threads (==traffic) increases.
-
-Reduce the maximum stack size by running::
-
-    ulimit -s 256
-
-in the startup script.
-