Test RAM read/write speed

[Valdis.Kletnieks at vt.edu]

On Wed, 01 Oct 2014 01:32:19 +0530, Ssagarr Patil said:
> May be a tool is needed at uboot level to test the speeds.

What will that actually *tell* you though?  Or more to the point,
what *actionable* information will that give you?  The cache speeds
and memory speeds are something you're stuck with unless you upgrade
the computer.  And especially in the ARM SoC world, "upgrade" means
"buy the next Raspberry Pi model" or "time for a new Beaglebone" or
whatever.

Now, what would be *useful* is a tool that measures how much you're
thrashing the L1/L2 cache and the TLB - often rewriting the code will
allow much better performance by minimizing cache/TLB misses, but you
need to know which code is sucking before you can make it un-sucking.

Also, that's a *different* question than what the memory speed is - at
that point, it's more about how effectively you're using the memory
bandwidth.
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