Date: Wed, 25 May 2005 10:53:42 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: bms@spc.org Cc: freebsd-arch@freebsd.org, cperciva@freebsd.org, ups@tree.com Subject: Re: Scheduler fixes for hyperthreading Message-ID: <20050525.105342.74713758.imp@bsdimp.com> In-Reply-To: <20050522025914.GD1108@empiric.icir.org> References: <428FC00B.3080909@freebsd.org> <1116729865.1917.92.camel@palm> <20050522025914.GD1108@empiric.icir.org>
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In message: <20050522025914.GD1108@empiric.icir.org>
Bruce M Simpson <bms@spc.org> writes:
: On Sat, May 21, 2005 at 10:44:25PM -0400, Stephan Uphoff wrote:
: > Beside benchmarking - is there any other real use for RDTSC ?
: > Is there any use of RDTSC that system requiring the security cannot live
: > without? (We could even try to emulate the instruction if we really need
: > to)
:
: A number of ports use RDTSC for high-resolution timing. The most obvious
: examples being machine emulators mostly used for gaming (UAE and MAME
: spring to mind, possibly also dosbox and others).
Which also makes it hard to emulate, since that adds a lot of
overhead to the numbers...
Warner
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