[Xen-devel] Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Nick Piggin wrote:
> Oh, _llc_ references/misses? Ouch.
>
> You have, what 32K L1I, 32K L1D, and 4MB L2? And even this microbenchmark
> is seeing increased L2 misses by nearly 3%. Hmm, I wonder where that is
> coming from? Instruction fetches?
>   
I assume so.  There should be no extra data accesses with 
CONFIG_PARAVIRT (hm, there's probably some extra stack/spill traffic, 
but I surely hope that's not falling out of cache).
   J

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