Date: Fri, 2 Dec 2016 10:15:15 -0700 From: Warner Losh <imp@bsdimp.com> To: John Baldwin <jhb@freebsd.org> Cc: hiren panchasara <hiren@strugglingcoder.info>, Warner Losh <imp@freebsd.org>, src-committers <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org> Subject: Re: svn commit: r309351 - head/etc/defaults Message-ID: <CANCZdfqW=xMAWFvVsWfHkYNsMsw51kER29Gw22jYsb03KmKk9g@mail.gmail.com> In-Reply-To: <3180246.4fqia12Gik@ralph.baldwin.cx> References: <201612010435.uB14Zh21020050@repo.freebsd.org> <20161201164807.GE27291@strugglingcoder.info> <CANCZdfp%2BOS%2BcePwvhMq%2BPeqnWycsBjjng287zbAefZCG690OHA@mail.gmail.com> <3180246.4fqia12Gik@ralph.baldwin.cx>
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On Fri, Dec 2, 2016 at 9:18 AM, John Baldwin <jhb@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@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
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