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From: John Baldwin <jhb@freebsd.org>
To: Warner Losh <imp@bsdimp.com>
Cc: hiren panchasara <hiren@strugglingcoder.info>,
 Warner Losh <imp@freebsd.org>, src-committers <src-committers@freebsd.org>,
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Subject: Re: svn commit: r309351 - head/etc/defaults
Date: Fri, 02 Dec 2016 08:18:13 -0800
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On Thursday, December 01, 2016 02:41:41 PM Warner Losh wrote:
> On Thu, Dec 1, 2016 at 9:48 AM, hiren panchasara
> <hiren@strugglingcoder.info> wrote:
> > On 12/01/16 at 04:35P, Warner Losh wrote:
> >> Author: imp
> >> Date: Thu Dec  1 04:35:43 2016
> >> New Revision: 309351
> >> URL: https://svnweb.freebsd.org/changeset/base/309351
> >>
> >> Log:
> >>   Revert the 'performance' setting to 'NONE' from C2.
> >
> > Just a note that this commit reverts r282110.
> 
> Yea, it's good for laptops, bad for servers. At least there's some
> Intel CPUs that this causes corruption with USB. That's being sorted
> out, but until that's done we need to fail more safe for our primary
> market.

It's also good for some servers as you need some cores in C-states
to get the maximum Turbo Boost on other cores (though that may have
been more true for earlier generations of i7 CPUs than more recent
generations).

-- 
John Baldwin