Explicitly state, that parallelism enhancing options are to be used
in parallel performance tests, if it is best practice to use them on
the respective versions. A prerequisite for those options is that
using them does not require, even under heavy load but assuming enough
capacity in the cluster, any jobs to be retried.

Signed-off-by: Klaus Aehlig <[email protected]>
Reviewed-by: Hrvoje Ribicic <[email protected]>

Cherry-picked from a305cb96e24303414ed4512932be8208fc5fdcca.

Signed-off-by: Klaus Aehlig <[email protected]>
---
 doc/design-performance-tests.rst | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/doc/design-performance-tests.rst b/doc/design-performance-tests.rst
index e3e2bf6..173289d 100644
--- a/doc/design-performance-tests.rst
+++ b/doc/design-performance-tests.rst
@@ -87,8 +87,12 @@ number of instances and parallel jobs can be tested 
realistically.
 The following tests are added to the QA:
 
   * Submitting twice as many instance creation request as there are
-    nodes in the cluster, using DRBD as disk template. As soon as a
-    creation job succeeds, submit a removal job for this instance.
+    nodes in the cluster, using DRBD as disk template.
+    The job parameters are chosen according to best practice for
+    parallel instance creation without running the risk of instance
+    creation failing for too many parallel creation attempts.
+    As soon as a creation job succeeds, submit a removal job for
+    this instance.
   * Submitting twice as many instance creation request as there are
     nodes in the cluster, using Plain as disk template. As soon as a
     creation job succeeds, submit a removal job for this instance.
-- 
2.0.0.526.g5318336

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