svn commit: r309351 - head/etc/defaults

[Warner Losh]

On Fri, Dec 2, 2016 at 9:18 AM, John Baldwin <jhb at freebsd.org> wrote:
> On Thursday, December 01, 2016 02:41:41 PM Warner Losh wrote:
>> On Thu, Dec 1, 2016 at 9:48 AM, hiren panchasara
>> <hiren at 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).

Once the corruption issues are solved, we can and should put this
back. Adrian is working on that.

Warner