Date: Mon, 20 Sep 1999 00:52:39 -0700 (PDT) From: Poul-Henning Kamp <phk@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/i386/conf files.i386 src/sys/i386/i386 mp_clock.c Message-ID: <199909200752.AAA30657@freefall.freebsd.org>
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phk 1999/09/20 00:52:39 PDT
Modified files:
sys/i386/conf files.i386
Added files:
sys/i386/i386 mp_clock.c
Log:
On PIIX4 based SMP systems use the PMTMR register for timecounting.
It is about 2.5 microseconds or roughly 3 times faster to use this
"PIIX" timecounter than the "i8254" timecounter. Resolution is
also 3 times better.
The code cheats and don't register the PCI device, because other pieces
of code want to use it too.
Originally spotted by: msmith
Revision Changes Path
1.269 +2 -1 src/sys/i386/conf/files.i386
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