I use the memtest86+ numbers about memory speed. It gives numbers for RAM and different cache levels. On Mon, Sep 29, 2014 at 11:42 PM, <Valdis.Kletnieks@xxxxxx> wrote: > On Tue, 30 Sep 2014 02:53:05 +0530, Ssagarr Patil said: > >> Is there any benchmarking tool to test read/write speed on Linux and which works on ARM ? > > This is always a hairy problem. Do you care about the memory speed of the > DIMM, or the actual *effective* memory speed? They can be very different, > due to the effects of L1/2/3 cache (both positive if there's a cache hit, > and negative if you need a cache line load, or if you need a line load > that requires a cache line writeback first), whether or not you have > a TLB active, and whether *that* has a hit or miss (which varies considerably > if you're walking an array and hitting a miss every 4K bytes, versus > walking a nest of pointers where you get a TLB miss almost every reference), > and a bunch of other issues I lack the caffeine to enumerate... > > And of course, the *effective* speed (which is what you should probably care > about rather than the *rated* speed) will differ based on workload due to > the factors listed above.... > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- Peter _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
