lkml.org 
[lkml]   [2007]   [Apr]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [patch 04/17] Add pagetable accessors to pack and unpack pagetable entries
Date
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?

-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-04-04 13:51    [from the cache]
©2003-2011 Jasper Spaans