linux-kernel - Re: scheduler vs hardware? (was Re: another i7 (linux) bug?)

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: <1264152860.4283.1442.camel@laptop>
Date:	Fri, 22 Jan 2010 10:34:20 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mike Galbraith <efault@....de>
Cc:	Luca Zini <luca.zini@...il.com>, aagaande@...il.com,
	rdelcueto@...mail.com, mingo@...e.hu,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Alex Chiang <achiang@...com>
Subject: Re: scheduler vs hardware? (was Re: another i7  (linux) bug?)

On Fri, 2010-01-22 at 10:25 +0100, Mike Galbraith wrote:
> On Fri, 2010-01-22 at 09:51 +0100, Peter Zijlstra wrote:
> 
> > My laptop does:
> > 
> > 
> > # time nice -n 19 lame -b 256 -V0 -h youcantdothat.wav - > /dev/null
> 
> > real    0m3.273s
> > user    0m3.217s
> > sys     0m0.022s
> > 
> > 
> > # time nice -n 0 lame -b 256 -V0 -h youcantdothat.wav - > /dev/null
> 
> > real    0m1.121s
> > user    0m1.102s
> > sys     0m0.013s
> 
> I don't see any way that can be scheduler (knocks wood).  Could it be
> cpufreq?  IIRC there is or was an ignore nice gizmo in there.

That's a laptop with full desktop bloat, I'm sure either firefox or evo
farted, or both.

--
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/