Dear users of the SuperMUC Petaflop system, for operational reasons the use of several performance counters on SuperMUC has been restricted for the foreseeable future. This may impact the usage of performance tools based on the PAPI library, e.g. Scalasca. We apologise for inconveniences caused by that. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/supermuc/aktuell/ali4589/ Nicolay Hammer