On Tue, Sep 30, 2014 at 10:02 PM, Ssagarr Patil <hugarsagar@xxxxxxxxxxx> wrote: > Hi, > > ---------------------------------------- >> Date: Tue, 30 Sep 2014 17:49:42 +0200 >> Subject: Re: Test RAM read/write speed >> From: peter.senna@xxxxxxxxx >> To: Valdis.Kletnieks@xxxxxx >> CC: hugarsagar@xxxxxxxxxxx; kernelnewbies@xxxxxxxxxxxxxxxxx >> >> I use the memtest86+ numbers about memory speed. It gives numbers for >> RAM and different cache levels. >> > you mean numbers for read/write ? I don't know. Check this out: https://plus.google.com/+PeterSenna/posts/iw6p2ZSU8VE > >> 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.... >>> > May be a tool is needed at uboot level to test the speeds. > > Thanks. > --Sagar > >>> _______________________________________________ >>> 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 > -- Peter _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
