lkml.org 
[lkml]   [2003]   [Jun]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [BENCHMARK] 12% improvement in fork load from mm3 to mm4
rwhron@earthlink.net wrote:
>
> > autoconf build test creates about 1.2 million processes in
> > 35 minutes. On quad xeon, there was an improvement of
> > ~ 12% between 2.5.70-mm3 and 2.5.70-mm4.
> >
> > Avg of 3 runs
> > 2.5.70-mm3 829.0
> > 2.5.70-mm4 737.9
>
> profile shows the biggest change is in do_page_fault.

Well that's amusing. In mm4 I replaced the patch which runs
remap_file_pages() against all prot_exec mappings with a patch which just
prefaults those mappings into pagecache.

The difference _should_ be that in mm3, all pte's are set up at mmap time.
So -mm4 should have more pagefaults, not less.

Something fishy is going on there. Makes one wonder if remap_file_pages()
is successfully avoiding the minor fault.

-
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: 2005-03-22 13:36    [W:0.064 / U:0.452 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site