Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT

From: Ingo Molnar
Date: Tue Jan 20 2009 - 10:14:20 EST



* Ingo Molnar <mingo@xxxxxxx> wrote:

> That shows the expected $cache risks here as well: i ran this on an
> Extreme Edition CPU which has a ton of L2 cache [4MB] which mutes L2
> $cache misses quite a bit.

[ there's no such thing as "L2 $cache misses" - what i wanted to say is
that while the instruction cache size is rather small and static, a
large L2 cache helps in keeping the costs of instruction-cache misses
low - hence my measurement skews in favor of paravirt. ]

Ingo
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