Date: Fri, 8 Aug 2008 16:50:03 GMT From: Mike Meyer <mwm@mired.org> To: freebsd-amd64@FreeBSD.org Subject: Re: amd64/121590: powerd(8) may not work correctly Message-ID: <200808081650.m78Go34B079711@freefall.freebsd.org>
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The following reply was made to PR amd64/121590; it has been noted by GNATS.
From: Mike Meyer <mwm@mired.org>
To: Gavin Atkinson <gavin@FreeBSD.org>
Cc: bug-followup@FreeBSD.org
Subject: Re: amd64/121590: powerd(8) may not work correctly
Date: Fri, 8 Aug 2008 12:15:06 -0400
On Fri, 08 Aug 2008 12:21:26 +0100
Gavin Atkinson <gavin@FreeBSD.org> wrote:
> On Wed, 2008-08-06 at 18:50 -0400, Mike Meyer wrote:
> > Here's the sysctl dev.cpu output you requested.
>
> Thanks for that. The symptoms you were seeing was that
> "sysctl dev.cpu.0.freq=200" would return "Invalid argument" but yet
> appear to actually set the frequency. Are you able to confirm that the
> CPU speed has actually dropped (e.g. by timing a compile, or similar)?
> It's not clear from your info whether the CPU frequency is actually
> changing, or if it's just the sysctl value that is changing.
>
> Please CC your response to bug-followup@FreeBSD.org so that it ends up
> in the PR audit trail.
I don't believe the cpu speed is actually changing:
bhuda# sysctl dev.cpu.0.freq
dev.cpu.0.freq: 200
bhuda# dhry
Dhrystone(1.1) time for 500000000 passes = 171.9
This machine benchmarks at 2908712 dhrystones/second
bhuda# sysctl dev.cpu.0.freq=2400
dev.cpu.0.freq: 200
sysctl: dev.cpu.0.freq: Invalid argument
bhuda# sysctl dev.cpu.0.freq
dev.cpu.0.freq: 2400
bhuda# dhry
Dhrystone(1.1) time for 500000000 passes = 165.4
This machine benchmarks at 3022085 dhrystones/second
<mike
--
Mike Meyer <mwm@mired.org> http://www.mired.org/consulting.html
Independent Network/Unix/Perforce consultant, email for more information.
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