On Wed, Feb 27, 2013 at 6:16 PM, sandeep kumar <coolsandyforyou@xxxxxxxxx> wrote: >>Try below points: >>1. I am not sure about snapdragon(is it Qualcomm?) but try >>CONFIG_CPU_DCACHE_DISABLE. > I did that already, device is not booting. In our architecture cache is > tightly coupled with CPU. Should be discussed with Qualcomm guys here as to the reason why it doesn't boot up. > >>2. You are better off programming some DMA master to do large (and >>uncached) reads/writes to RAM and timing that. > DMA is not a standard way, i suppose, as it depends on what I/O peripheral > we are doing the DMA. You are doing I/O to RAM so it should do what you want. CPU->DMA CONTROLLER->RAM > >>You should always add arm mailing list and please mention the chip set >> details. >>cat /proc/cpuinfo is a great way > Processor : ARMv7 Processor rev 2 (v7l) > BogoMIPS : 163.38 > Features : swp half thumb fastmult vfp edsp neon vfpv3 tls > CPU implementer : 0x51 > CPU architecture: 7 > CPU variant : 0x1 > CPU part : 0x00f > CPU revision : 2 > > Thanks > Sandeep > > > > > On Wed, Feb 27, 2013 at 5:37 PM, anish singh <anish198519851985@xxxxxxxxx> > wrote: >> >> On Tue, Feb 26, 2013 at 5:01 PM, sandeep kumar >> <coolsandyforyou@xxxxxxxxx> wrote: >> > Hi All >> > In performance benchmark tools, When we profile read/write timings >> > mostly, >> > those read/writes are done to cache only. >> > >> > I want to measure my DDR(RAM chip) performance. >> > So i want to make sure, every read/write should happen to DDR RAM chip >> > only. >> Try below points: >> 1. I am not sure about snapdragon(is it Qualcomm?) but try >> CONFIG_CPU_DCACHE_DISABLE. >> 2. You are better off programming some DMA master to do large (and >> uncached) reads/writes to RAM and timing that. >> >> However simple uncached LDR/STR from the CPU may not be a great >> measure of RAM controller perf. >> >> You should always add arm mailing list and please mention the chip set >> details. >> cat /proc/cpuinfo is a great way >> > >> > How can i achieve this...Any ideas/suggestions...? >> > >> > -- >> > With regards, >> > Sandeep Kumar Anantapalli, >> > >> > _______________________________________________ >> > Kernelnewbies mailing list >> > Kernelnewbies@xxxxxxxxxxxxxxxxx >> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> > > > > > > -- > With regards, > Sandeep Kumar Anantapalli, _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
