Re: Scheduler fixes for hyperthreading

From: M. Warner Losh (imp_at_bsdimp.com)
Date: 05/25/05

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    Date: Wed, 25 May 2005 10:53:42 -0600 (MDT)
To: bms@spc.org

    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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