Re: [PATCH] 2/2 2.5.45 cleanup & add original copy_ro/from_user

Andi Kleen
2002-11-02T12:16:44Z

> It's easy to time memcpy() but harder to measure susequent
> cache misses when copied data gets accessed. We can read it
> back after memcpy and measure memcpy()+read, but is entire
> copy gets used immediately after memcpy() in real world usage?
> We're in benchmarking hell :(

You test common operations, like pipe bandwidth or ioctls.

-Andi