Subject: Re: kern/36995: ENHANCED_SPEEDSTEP dangerous on newer Core 2 Duo
To: None <kern-bug-people@netbsd.org, gnats-admin@netbsd.org,>
From: Alan Barrett <apb@cequrux.com>
List: netbsd-bugs
Date: 09/17/2007 10:50:03
The following reply was made to PR kern/36995; it has been noted by GNATS.
From: Alan Barrett <apb@cequrux.com>
To: gnats-bugs@NetBSD.org
Cc: netbsd-bugs@NetBSD.org
Subject: Re: kern/36995: ENHANCED_SPEEDSTEP dangerous on newer Core 2 Duo
CPUs
Date: Mon, 17 Sep 2007 12:46:27 +0200
On Mon, 17 Sep 2007, jmcneill@invisible.ca wrote:
> Proper fix: Unknown; is there a feature flag we can check when we
> calculate est frequencies to ignore the highest value?
Even without a feature flag, it seems that we have enough information to
detect this situation. I'll highlight two items from your dmesg output:
> cpu0: Intel(R) Core(TM)2 Duo CPU T7100 @ 1.80GHz, 1795.65 MHz
^^^^^^^^^^^
> cpu0: Enhanced SpeedStep (1420 mV) 2000 MHz
^^^^^^^^
--apb (Alan Barrett)