linux-kernel - Re: [PATCH 2.6.28 1/2] memory: improve find

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 5 Feb 2009 20:41:25 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Lowengrub <lowdanie@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.28 1/2] memory: improve find_vma


* Daniel Lowengrub <lowdanie@...il.com> wrote:

> On Sun, Feb 1, 2009 at 3:00 PM, Ingo Molnar <mingo@...e.hu> wrote:
> >
> >  you should time it:
> >
> >  time ./mmap-perf
> >
> > and compare the before/after results.
> >
> >        Ingo
> >
> 
> I made a script that runs 'time ./mmap-perf' 100 times and outputs the
> average.  The output on the standard kernel was:
>
>  real: 1.022600
>  user: 0.135900
>  system: 0.852600
>
> The output after the patch was:
>
>  real: 0.815400
>  user: 0.113200
>  system: 0.622200
>
> These results were consistent which isn't surprising considering the
> fact that they themselves are averages.
> What do you think?

Those nymbers look very convincing to me, a cool 25.4% speedup!
mmap-perf is very MM intense - including vma lookup.

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