Hi Stephane, Thanks for the response.
I tried to find out other alternatives to disable prefetching on this architecture. But no luck so far. I will probably move on to a different architecture. Regards, Ram On Sun, Feb 26, 2012 at 3:58 PM, stephane eranian <eran...@googlemail.com> wrote: > On Thu, Feb 23, 2012 at 10:16 PM, Ramachandra CN > <cn.ramachan...@gmail.com> wrote: >> Hello, >> >> I have some questions related to hardware prefetcher events on Intel Xeon >> processor with the below configuration. >> $ uname -a >> Linux 2.6.34-gentoo-r1 #2 SMP Mon Feb 20 12:07:35 CST 2012 x86_64 Intel(R) >> Xeon(R) CPU E5520 @ 2.27GHz GenuineIntel GNU/Linux >> >> I am trying to count the number of hardware prefetch events, before and >> after disabling hardware prefetching using BIOS. >> I have followed the steps mentioned in the below link to disable h/w >> prefetching in BIOS. >> http://software.intel.com/en-us/articles/optimizing-application-performance-on-intel-coret-microarchitecture-using-hardware-implemented-prefetchers/ >> > Something is not right here. > You processor E5520 is not a Core micro-architecture but Nehalem-EP. > As such, I believe the technique > above to disable HW prefetcher does not apply. > > >> However I don't see much difference in the values of the counter after h/w >> prefetching is disabled. The counter value remains approximately the same >> before and after disabling h/w prefetching. I also tried >> using "PERF_COUNT_HW_CACHE_L1D:PREFETCH" event. But don't see much >> difference. >> I have used the perf_examples program of libpfm-4.2,.0 as below. >> ./task -e L1D_PREFETCH:REQUESTS openmp_test >> >> Could someone in the group please comment if expecting these counters to >> change, after disabling h/w prefetching in BIOS is correct? >> >> Regards, >> Ram >> Graduate student >> >> University of Houston >> >> >> >> ------------------------------------------------------------------------------ >> Virtualization & Cloud Management Using Capacity Planning >> Cloud computing makes use of virtualization - but cloud computing >> also focuses on allowing computing to be delivered as a service. >> http://www.accelacomm.com/jaw/sfnl/114/51521223/ >> _______________________________________________ >> perfmon2-devel mailing list >> perfmon2-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/perfmon2-devel >> ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
