Date: Mon, 20 Sep 1999 01:05:57 -0700 From: Mike Smith <mike@smith.net.au> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: Mike Smith <mike@smith.net.au>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/conf files.i386 src/sys/i386/i386 mp_clock.c Message-ID: <199909200805.BAA29815@dingo.cdrom.com> In-Reply-To: Your message of "Mon, 20 Sep 1999 10:06:53 %2B0200." <21408.937814813@critter.freebsd.dk>
next in thread | previous in thread | raw e-mail | index | archive | help
> In message <199909200752.AAA29722@dingo.cdrom.com>, Mike Smith writes: > > >> On PIIX4 based SMP systems use the PMTMR register for timecounting. > > > >You should be using this on all systems with the PIIX4, not just SMP > >systems. > > No, the TSC is far superior on UP, (unless destroyed by APM), it > has roughly 100 times better resolution and is twice as fast to > query. It is, however, as you point out, non-deterministically unreliable. I'm fairly certain that we should option out the use of the TSC by default - it is simply biting too many people for too little gain. > Once we get the ACPI stuff rolling we can use the PIIX for APM too. That would be "use the PIIX for ACPI", since we won't be using APM. -- \\ The mind's the standard \\ Mike Smith \\ of the man. \\ msmith@freebsd.org \\ -- Joseph Merrick \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199909200805.BAA29815>