Hi, I'm trying to measure the memory-bandwidth consumed by processes on a dual socket Intel Dunnington with E7450 processors.
To do so I use libpfm to meaure the performance counters. I meaure eventes releated to cycles, instructions or cache misses without problems. However, I have not been able to measure the BUS_TRANS_BURST or BUS_TRANS_MEM events. I tried with the kernel 2.6.29 using libpfm-3.9 and pfmon and with the latests kernel and libpfm4 version but in both cases the memory transaction measures return zero (the other events work fine and I have even measured BUS_TRANS_MEM event using a Inel X3320). Can anyone imagine whats wrong? I wonder if the problem may be related to using a dual socket system or if it could be specific of Dunnington processors. A second questions is why events LAST_LEVEL_CACHE_MISSES and LAST_LEVEL_CACHE_REFERENCES refer to L2 misses/references in processors with L3 cache. Thanks a lot. Josué ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
