Date: Fri, 14 Oct 2005 21:18:51 -0700 From: =?ISO-8859-1?Q?Bj=F6rn_K=F6nig?= <bkoenig@cs.tu-berlin.de> To: Peter B <pb@ludd.ltu.se> Cc: freebsd-questions@freebsd.org Subject: Re: TSC Timer "Quality" ? Message-ID: <4350832B.5020600@cs.tu-berlin.de> In-Reply-To: <200510141611.j9EGBCg2008762@brother.ludd.ltu.se> References: <200510141611.j9EGBCg2008762@brother.ludd.ltu.se>
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Peter B schrieb:
Intel pentium cpu timer tsc:
'Timecounter "TSC" frequency X Hz quality Y' (from dmesg)
What is the definition of "quality" ..?
I have looked briefly in the /usr/src/sys/i386/i386/tsc.c sourcefile and
the intel-celeron datasheet. Without finding anything useful.
From src/sys/sys/timetc.h:
54 int tc_quality;
55 /*
56 * Used to determine if this timecounter is
better than
57 * another timecounter higher means better.
Negative
58 * means "only use at explicit request".
59 */
As far as I understand this, it is used internally only.
Regards
Björn
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