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Date:      Fri, 27 Jul 2012 09:21:25 -0600
From:      Peter Grehan <grehan@freebsd.org>
To:        Konstantin Belousov <kostikbel@gmail.com>
Cc:        Jim Harris <jimharris@freebsd.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, Andriy Gapon <avg@freebsd.org>, Bruce Evans <brde@optusnet.com.au>, svn-src-head@freebsd.org, Jung-uk Kim <jkim@freebsd.org>
Subject:   Re: svn commit: r238755 - head/sys/x86/x86
Message-ID:  <5012B1F5.6030403@freebsd.org>
In-Reply-To: <20120727083529.GA2676@deviant.kiev.zoral.com.ua>
References:  <500FE6AE.8070706@FreeBSD.org> <20120726001659.M5406@besplex.bde.org> <50102C94.9030706@FreeBSD.org> <20120725180537.GO2676@deviant.kiev.zoral.com.ua> <50103C61.8040904@FreeBSD.org> <20120726170837.Q2536@besplex.bde.org> <20120726104918.GW2676@deviant.kiev.zoral.com.ua> <20120726213001.K3621@besplex.bde.org> <20120726175947.GZ2676@deviant.kiev.zoral.com.ua> <5011901B.1060008@freebsd.org> <20120727083529.GA2676@deviant.kiev.zoral.com.ua>

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>>   CPUID causes an unconditional exit in VT-x/SVM so it would be best to
>> avoid that if possible.
>
> The only place where the use of CPUID in tsc patch seems to be reasonable
> is at the SMP test, since it is too much burden to check SSE2/Intel/AMD
> nuances at the boot time, to be redone later anyway. Would it be a serious
> issue for monitors to get several thousands of CPUID traps at boot only ?

  The SMP tsc test is skipped for VM guests so it should be fine there.

later,

Peter.



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