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 ? > 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 _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
