linux-kernel - Re: [PATCH 0/8] locking/core patches

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]

Message-Id: <20140211000330.d791513d.akpm@linux-foundation.org>
Date:	Tue, 11 Feb 2014 00:03:30 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, Jason Low <jason.low2@...com>,
	Waiman Long <waiman.long@...com>, mingo@...nel.org,
	paulmck@...ux.vnet.ibm.com, torvalds@...ux-foundation.org,
	tglx@...utronix.de, riel@...hat.com, davidlohr@...com,
	hpa@...or.com, andi@...stfloor.org, aswin@...com,
	scott.norton@...com, chegu_vinod@...com
Subject: Re: [PATCH 0/8] locking/core patches

On Tue, 11 Feb 2014 08:17:00 +0100 Peter Zijlstra <peterz@...radead.org> wrote:

> On Mon, Feb 10, 2014 at 03:02:30PM -0800, Andrew Morton wrote:
> > On Mon, 10 Feb 2014 20:58:20 +0100 Peter Zijlstra <peterz@...radead.org> wrote:
> > 
> > > Hi all,
> > > 
> > > I would propose merging the following patches...
> > > 
> > > The first set is mostly from Jason and tweaks the mutex adaptive
> > > spinning, AIM7 throughput numbers:
> > > 
> 
>                          Jobs/min/ Jobs/sec/ Time:   Time:  Time:   Time:           Running child time
>          Forks  Jobs/min   child    child parent  childU childS  std_dev   JTI   :max  :min
> 
> > > PRE:  100   2000.04  21564.90 2721.29 311.99     3.12       0.01     0.00     99
> > > POST: 100   2000.04  42603.85 5142.80 311.99     3.12       0.00     0.00     99
> > 
> > What do these columns represent?  I'm guessing the large improvement
> > was in context switches?
> 
> I pasted the header from reaim above;

hmpf.  I wonder what's the difference between Jobs/min, Jobs/min(child)
and Jobs/sec(child), which is not Jobs/min(child) / 60.

> I'm not entirely sure what the
> bloody thing does and I hate that it takes hours to get these numbers :/
>
> Bloody stupid benchmark if you ask me.

heh, yes, it's stupid how long many benchmarks take.  Ditch it.  A
change like this should be testable with a 30-line microbenchmark which
runs in 5 seconds tops.
--
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/