Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [patch 04/17] Add pagetable accessors to pack and unpack pagetable entries | Date | Wed, 4 Apr 2007 13:47:42 +0200 |
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On Wednesday 04 April 2007 11:25:57 Jeremy Fitzhardinge wrote: > Andi Kleen wrote: > > What do the benchmarks say with CONFIG_PARAVIRT on native hardware > > compared to !CONFIG_PARAVIRT. e.g. does lmbench suffer? > > Barely. There's a slight hit for not using patching, and patching is > almost identical to native performance. The most noticeable difference > is in the null syscall microbenchmark, but once you get to complex > things the difference is in the noise.
Why is there a difference for null syscall? I had assumed we patched all the fast path cases relevant there. Do you have an idea where it comes from?
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