Date: Tue, 15 Mar 2011 17:01:11 -0400 From: John Baldwin <jhb@freebsd.org> To: "Jung-uk Kim" <jkim@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r219676 - head/sys/x86/x86 Message-ID: <201103151701.11708.jhb@freebsd.org> In-Reply-To: <201103151947.p2FJlK3L057573@svn.freebsd.org> References: <201103151947.p2FJlK3L057573@svn.freebsd.org>
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On Tuesday, March 15, 2011 3:47:20 pm Jung-uk Kim wrote: > Author: jkim > Date: Tue Mar 15 19:47:20 2011 > New Revision: 219676 > URL: http://svn.freebsd.org/changeset/base/219676 > > Log: > Do not let machdep.tsc_freq modify tsc_freq itself. It is bad for i386 as > it does not operate atomically. Actually, it serves no purpose. > > Noticed by: bde Ouch, please revert! We have depended on this for testing to workaround BIOS issues (e.g. the USB SMI# handler firing at a bad time during boot causing the TSC frequency to be calculated incorrectly). I agree it's a hack that this works, but it has actually proven useful in the past. -- John Baldwin
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