Test RAM read/write speed

[Peter Senna Tschudin]

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 at vt.edu> 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....
>
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-- 
Peter